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Robert Block: Amazon KDP author data
As of Nov 6, 2026, Robert Block has 8 books on Amazon, 6 of them on a best-seller list in the last 30 days (best rank #1), mostly in Marbles, Toys, Antiques Care & Reference.
| Median price | $18.59 |
|---|---|
| Price range (middle 50%) | $16.27 – $34.97 |
| Median reviews | 44 |
| Total reviews | 2,119 |
| New books (30 days) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- 75% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
Robert Block's best-ranked books
-
Marbles Identification and Price Guide
by Robert Block
- Price$3.99
- Rating4.6
- Reviews971
-
Marbles Identification and Price Guide
by Robert Block
- Price$18.59
- Rating4.6
- Reviews971
-
Collecting Early Machine Made Marbles from the M.F. Christensen & Son Company and Christensen Agate Company
by Robert Block
- Price$24.95
- Rating4.7
- Reviews44
-
Marbles: Identification and Price Guide (Schiffer Book for Collectors)
by Robert Block
- Price$102
- Rating4.6
- Reviews30
-
Pictorial Price Guide of Marbles
by Robert Block
- Price-
- Rating4.3
- Reviews7
-
Marbles Illustrated: Prices at Auction (A Schiffer Book for Collectors)
by Robert Block
- Price$44.99
- Rating4.0
- Reviews23
-
Disaster: Hurricane Katrina and the Failure of Homeland Security
by Robert Block
- Price$18.55
- Rating4.6
- Reviews73
- Published2006-08
-
Psycho II (Italian Edition)
by Robert Block
- Price$13.99
- Reviews-
Main categories
FAQ
How many books does Robert Block have on Amazon?
KDPTop tracks 8 of their books; 6 made an Amazon list in the last 30 days.
Which categories does Robert Block publish in?
Their books chart most often in Marbles, Toys, Antiques Care & Reference.
How does Robert Block price their books?
The median price is $18.59; half of the books cost $16.27–$34.97.
Has Robert Block released new books recently?
0 new books in the last 30 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.