Amazon vs eBay for books: what's different
Amazon and eBay both have large used book markets, but they serve different buyer intentions and attract different sellers. Understanding the differences helps you use each platform strategically rather than treating them as interchangeable.
Amazon is where most buyers go when they know exactly what book they want. They search by title, author, or ISBN. Amazon's product pages aggregate all seller listings for the same edition, so you're competing directly on price and condition rating against every other Amazon seller who has the same book. The search experience is transactional: buyer wants "Thinking, Fast and Slow hardcover in Good condition," buyer sees your listing alongside 40 others.
eBay is where buyers go for rare, out-of-print, signed, first editions, and collectibles. eBay is also better for books that don't have ISBNs (pre-1970 publications), international editions, and textbooks where buyers comparison shop across platforms. eBay's listing format is more flexible: you write your own description rather than contributing to a shared product page, which matters for books where condition details and provenance are part of the value.
Amazon books
- High volume, commodity used books
- Textbooks and academic titles
- FBA fulfillment option available
- ISBN-based catalog matching
- Price competition is intense
- Rare/collectible value often missed
eBay books
- Rare, signed, first editions
- Books without ISBNs (pre-1970)
- Full listing description control
- Auction format for high-value items
- More listing work per item
- Slower velocity for common titles
The practical implication: common used books and textbooks should be listed on Amazon where the buyers are. Anything that might be valuable because of its rarity, edition, or provenance should be on eBay where description and storytelling can command a premium.
ISBN matching and why it matters
An ISBN (International Standard Book Number) is the unique identifier assigned to each edition of a book. ISBNs are how Amazon matches your listing to their product catalog. When you scan or type an ISBN, Amazon pulls up the exact edition you have, and your listing appears alongside every other seller of that same edition.
ISBN strategy matters for book resellers because:
- Different ISBNs = different editions = different buyer pools. The 1985 hardcover first edition and the 2010 paperback reissue of the same title are different products with different buyer intentions. List them as different items, because they are.
- ISBN-10 vs ISBN-13. Books published before 2007 typically have ISBN-10 codes. Books published after 2007 have ISBN-13 codes (which are just the ISBN-10 with "978" prepended and a new check digit). Both Amazon and eBay accept both formats, but use the ISBN printed in the book to be accurate.
- Books without ISBNs. Books published before 1970 often have no ISBN. On Amazon, these are listed as "collectibles" with manual identification. On eBay, you write the full listing from scratch. These are the books where eBay often performs better.
The ISBN scanning workflow
If you're sourcing books from thrift stores, estate sales, or library sales, the fastest workflow is a scanning app. Apps like ScoutIQ, Scouter, or Amazon's seller app let you scan ISBNs with your phone and see the current lowest price, sales rank, and your potential profit margin in seconds. Scan before you buy. A book that looks valuable might have 200 copies listed on Amazon at $1.99. A book you'd overlook might have 3 copies listed at $35.
Condition grading: Amazon's system vs eBay's
Amazon and eBay use different language for book condition, and getting this right matters. Buyers rely on your condition description to make purchase decisions. Overstating condition leads to returns and bad reviews. Understating it means you sell books for less than they're worth.
| Amazon Condition | eBay Equivalent | What It Means |
|---|---|---|
| New | Brand New | Unread, no marks, perfect dust jacket. If it's been opened, it's not New. |
| Like New | Like New | Read once or twice, no marks, minimal wear. Spine may show slight creasing. |
| Very Good | Very Good | Shows some wear, may have minor highlighting or writing. No missing pages. |
| Good | Good | Clearly used, possible highlighting, writing, torn pages acceptable if disclosed. |
| Acceptable | Acceptable | Heavily worn, possibly missing pages or cover. Still readable and complete. |
A few practices that prevent returns and build positive feedback:
- Always disclose specific defects in the condition notes. "Highlighting in chapters 3 and 4, no other marks" is more trustworthy than just "Good."
- When in doubt, grade down. A buyer who receives a book in better condition than expected is happy. A buyer who receives a book in worse condition than described opens a return.
- For valuable or rare books, describe the condition in detail even beyond what the condition field allows. On eBay especially, provenance notes ("ex-library copy, library stamp on spine") help buyers make informed decisions.
FBA for books: when it makes sense
Fulfillment by Amazon (FBA) means sending your books to Amazon's warehouse and letting Amazon handle storage, picking, packing, and shipping. Your books become Prime-eligible. This is powerful for high-velocity titles where Prime shipping drives purchasing decisions.
But FBA isn't right for all books, and the economics don't always work.
FBA makes sense for books when:
- The book has a sales rank under 300,000 (it's selling regularly, not sitting for months)
- Your margin after FBA fees is at least $3-5
- The book weighs under 1 pound (heavier books have higher FBA fees that erode margins fast)
- You have multiple copies (FBA's fixed fees are easier to absorb with volume)
FBA doesn't make sense for books when:
- Sales rank is over 1,000,000 (the book might sit in FBA for 6+ months, accruing storage fees)
- The book is oversized (FBA has substantially higher fees for books over certain dimensions)
- Your margin is thin (below $3 after all fees, FBM is usually better)
- The book has collectible value best described with your own listing (rare editions belong on eBay, not FBA's commodity catalog)
The FBA math for books: Amazon charges roughly $3.22 per standard-size book in FBA fees (pick, pack, and weight handling) plus $0.75-1.00/month in storage. You'll also pay Amazon's 15% referral fee on the sale price. A book selling for $15 might net you $8-9 after FBA fees. The same book sold via FBM (merchant fulfilled) might net $11-12. The tradeoff is your time to pack and ship vs the margin difference.
Pricing books across two platforms
The goal is to price consistently but not identically. Amazon buyers expect competitive pricing because they can see your competitors on the same page. eBay buyers are sometimes willing to pay more if your listing tells a better story or the book is hard to find.
For commodity used books
Price within 10-15% of the lowest comparable listing on each platform. Going too high means you never sell. Going below the lowest price consistently signals to the market that something is wrong with your copy.
For textbooks
Textbook pricing fluctuates dramatically with the academic calendar. Prices spike before fall and spring semesters and drop after. If you have textbooks, price them at the high end in July and January. Drop prices in February and September if they haven't moved.
For rare or valuable books
Use eBay's sold listings data. Search for your book, filter by "Sold listings," and see what comparable copies actually sold for (not just what sellers are asking). Asking price and selling price are often very different for rare books. Sold listings tell you what buyers actually paid.
Keeping inventory synced across Amazon and eBay
For most books, you have one copy. You either sell it on Amazon or you sell it on eBay. The moment it sells on one platform, you need to remove it from the other immediately.
Manually managing this works at 10-20 books. At 100+ listings across both platforms, the gap between "sold on Amazon" and "removed from eBay" is a real oversell risk. Someone can buy a book on eBay while your Amazon order is processing and you don't know about it yet.
Commerce Kitty connects Amazon and eBay and handles this automatically. When a book sells on Amazon, the eBay listing is marked sold within seconds. When it sells on eBay first, the Amazon listing updates the same way. You set it up once and it runs every time.
For book resellers specifically, the one-copy problem makes inventory sync more critical than in almost any other product category. There's no "I'll just ship the other copy" fallback. The copy is gone.