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Thomas L Harfst Jr.: Amazon KDP author data
As of Nov 6, 2026, Thomas L Harfst Jr. has 19 books on Amazon, 19 of them on a best-seller list in the last 30 days (best rank #4), mostly in GURPS, Dungeons & Dragons, Warhammer.
| Median price | $19.95 |
|---|---|
| Price range (middle 50%) | $17.45 – $25.45 |
| Median reviews | 1 |
| Total reviews | 50 |
| New listings (30 days, incl. new editions) | 5 |
| Breakout books (30 days) | 1 |
What stands out
- 100% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $19.95, 21% above the median of their main category, GURPS.
- 5 new listings in the last 30 days (new editions included), 1 of them broke into a Best Sellers list.
Thomas L Harfst Jr.'s best-ranked books
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Darkened Delves: Volume II: Treasures, Oddities & Arcane Secre
by Thomas L Harfst Jr.
- Price$14.95
- Rating5.0
- Reviews1
-
Darkened Treasures: A Tome of 170+ Grimdark Magic Items for TTRPGs: Unleash a Hoard of Gothic Horrors and Cursed Artifacts Upon Your Game
by Thomas L Harfst Jr.
- Price$12.95
- Rating3.9
- Reviews8
-
Infinity Engine: A Compendium of Sci-Fi Random Tables for TTRPGs
by Thomas L Harfst Jr.
- Price$24.95
- Reviews-
-
Darkened Treasures: A Tome of 170+ Grimdark Magic Items for TTRPGs: Unleash a Hoard of Gothic Horrors and Cursed Artifacts Upon Your Game
by Thomas L Harfst Jr.
- Price$20.95
- Rating3.9
- Reviews8
-
Random Access Tables: Over 100+ Random Tables for Cyberpunk themed TTRPGs
by Thomas L Harfst Jr.
- Price$29.95
- Rating5.0
- Reviews1
-
Blackened Omens: Random Tables for Grimdark & Dark Fantasy Roleplaying
by Thomas L Harfst Jr.
- Price$29.95
- Rating5.0
- Reviews1
-
Darkened Denizens: A Grimdark Monster Compendium for OSR RPGs - Compatible with Old School Essentials, Dungeon Crawl Classics, Shadowdark, and 1e D&D
by Thomas L Harfst Jr.
- Price$12.95
- Rating3.4
- Reviews7
-
Darkened Dweomers: 350+ Spells for OSR RPGs (AD&D 1E, OSE, DCC, Shadowdark): New Spells & Twisted Variants for Old-School Games
by Thomas L Harfst Jr.
- Price$19.95
- Rating4.2
- Reviews5
-
Darkened Denizens: A Grimdark Monster Compendium for OSR RPGs - Compatible with Old School Essentials, Dungeon Crawl Classics, Shadowdark, and 1e D&D
by Thomas L Harfst Jr.
- Price$21.95
- Rating3.4
- Reviews7
-
The Codex of Chaos: The Ultimate Random Table Compendium for Fantasy TTRPGs
by Thomas L Harfst Jr.
- Price$19.95
- Rating5.0
- Reviews5
Main categories
FAQ
How many books does Thomas L Harfst Jr. have on Amazon?
KDPTop tracks 19 of their books; 19 made an Amazon list in the last 30 days.
Which categories does Thomas L Harfst Jr. publish in?
Their books chart most often in GURPS, Dungeons & Dragons, Warhammer.
How does Thomas L Harfst Jr. price their books?
The median price is $19.95; half of the books cost $17.45–$25.45.
Has Thomas L Harfst Jr. released new books recently?
5 new books in the last 30 days, 1 of which reached a Best Sellers list.
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.