KDP categories · Top KDP authors
Reference (Antiques Care & Reference, Books): Amazon KDP category data
Amazon Books Best Sellers data for Reference (Antiques Care & Reference, Books), updated Nov 2, 2026: median price $21, median 100 reviews, average rating 4.5 and a KDPTop opportunity score of 32/100 (highly competitive).
| Price range (middle 50%) | $16.99 – $29.99 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 8% |
| Books on the list | 100 |
| Store | Books |
Top 10 Reference best sellers
-
State Quarter 1999-2009: Collector's State Quarter Folder
by Warman's
- List rank#1
- Price$6.50
- Rating4.7
- Reviews12,390
-
National Park Quarters: 50 States + District of Columbia & Territories: Collector's Quarters Folder 2010-2021 (Warman's Collector Coin Folders)
by Warman's
- List rank#2
- Price$6.51
- Rating4.7
- Reviews14,609
-
Strike It Rich with Pocket Change: Error Coins Bring Big Money
by Ken Potter
- List rank#3
- Price$13.59
- Rating4.6
- Reviews3,552
-
Lincoln Cents 1909-1958 Collector's Folder (Warman's Collector Coin Folders)
by Warman's
- List rank#4
- Price$6.52
- Rating4.7
- Reviews7,599
-
![The Updated Lincoln Penny Collecting Bible: [4 in 1] New Guide to Finding Rare Mint Errors book cover by Caleb J. Browning](https://images-na.ssl-images-amazon.com/images/I/71Czd7xBI3L._AC_UL300_SR300,200_.jpg)
The Updated Lincoln Penny Collecting Bible: [4 in 1] New Guide to Finding Rare Mint Errors, High-Value Coins & Profiting Without Costly Mistakes (Lincoln Cent Errors 1909–2025, Omega Privy Penny)
by Caleb J. Browning
- List rank#5
- Price$19.99
- Rating4.6
- Reviews212
-
The Ultimate Cigar Book: 4th Edition
by Richard Carleton Hacker
- List rank#6
- Price$13
- Rating4.8
- Reviews2,381
-
The Glow That Won't Go Out: The Complete Collector's Guide to Vintage Holiday Blow Molds
by Curtiss Wayne Andrews
- List rank#7
- Price$21.99
- Rating4.0
- Reviews7
-
State Quarters 1999-2009 Deluxe Collector's Folder: District of Columbia and Territories, Philadelphia and Denver Mints (Warman's Collector Coin Folders)
by Warman's
- List rank#8
- Price$8.39
- Rating4.7
- Reviews3,354
-
Jefferson Nickels 1970-2015: Collector's Jefferson Nickels Folder
by Warman's
- List rank#9
- Price$7.99
- Rating4.7
- Reviews2,889
-
Official ANA Grading Standards for United States Coins (Official American Numismatic Association Grading Standards for United States Coins)
by Kenneth Bressett
- List rank#10
- Price$18.59
- Rating4.7
- Reviews657
FAQ
Is Reference a good niche for Amazon KDP?
Its KDPTop opportunity score is 32/100, which makes it highly competitive. The median best seller has 100 reviews and sells for $21.
How many reviews do you need to rank in Reference?
The median best seller has 100 reviews, and 50% of them have fewer than 100.
What do Reference best sellers cost?
The median price is $21; half of the best sellers are priced between $16.99 and $29.99.
Can new books break into Reference?
8% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.