KDP categories · Top KDP authors
Castmark Press: Amazon KDP author data
As of Nov 6, 2026, Castmark Press has 9 books on Amazon, 7 of them on a best-seller list in the last 30 days (best rank #6), mostly in PMP Exam, Technical, Project Management.
| Median price | $17.47 |
|---|---|
| Price range (middle 50%) | $12.23 – $22.48 |
| Median reviews | 18 |
| Total reviews | 66 |
| New listings (30 days, incl. new editions) | 4 |
| Breakout books (30 days) | 2 |
What stands out
- 78% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $17.47, 47% below the median of their main category, PMP Exam.
- 4 new listings in the last 30 days (new editions included), 2 of them broke into a Best Sellers list.
Castmark Press's best-ranked books
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PMP Exam Prep 2026-2027: PMBOK 8th Edition Study Guide for the New July 2026 Exam Outline — 800+ Practice Questions, Full-Length Tests, AI & Sustainability ... (Castmark Project Management Exam Prep)
by Castmark Press
- Price$12.99
- Rating4.9
- Reviews18
- Published2026-07
-
PMP Exam Prep 2026-2027: PMBOK 8th Edition Study Guide for the New July 2026 Exam Outline — 800+ Practice Questions, Full-Length Tests, AI & ... Plan (Castmark Project Management Exam Prep)
by Castmark Press
- Price$29.99
- Rating4.9
- Reviews18
-
PMP Visual Study Guide 2026-2027: 50 Decision Maps for the July 2026 Exam - People, Process, Business Environment, Agile, Hybrid, EVM Formulas, and ... (Castmark Project Management Exam Prep)
by Castmark Press
- Price$18.95
- Reviews-
-
CompTIA Security+ Study Guide 2027: Complete Guide for Exam SY0-801 (V8), Draft-Aligned Edition — 27 Chapters, 894 Practice Questions with Full Explanations, 3 Practice Exams, and 20 PBQs
by Castmark Press
- Price$9.95
- Rating4.8
- Reviews6
-
CompTIA Security+ Study Guide 2027: Complete Guide for Exam SY0-801 (V8), Draft-Aligned Edition — 27 Chapters, 894 Practice Questions with Full Explanations, 3 Practice Exams, and 20 PBQs
by Castmark Press
- Price$29.95
- Rating4.8
- Reviews6
-
PMP Exam Prep 2026-2027: PMBOK 8th Edition Study Guide for the New July 2026 Exam Outline — 800+ Practice Questions, Full-Length Tests, AI & ... Plan (Castmark Project Management Exam Prep)
by Castmark Press
- Price-
- Rating4.9
- Reviews18
- Published2026-07
-
THE SUSPECT FILES: 21,000 Suspects. Three Cases. One Killer Each. An Immersive Murder Mystery Logic Puzzle Book for Adults
by Castmark Press
- Price$15.99
- Reviews-
- Published2026-07
-
Illinois CDL Study Guide & Exam Prep 2026-2027: 480 Practice Questions, 25 Chapters, Four Explanations for Every Question, and Companion App with Audio Study Mode (CDL State Series)
by Castmark Press
- Price$9.95
- Reviews-
-
Illinois CDL Study Guide & Exam Prep 2026-2027: 480 Practice Questions, 25 Chapters, Four Explanations for Every Question, and Companion App with Audio Study Mode (CDL State Series)
by Castmark Press
- Price$19.99
- Reviews-
Main categories
FAQ
How many books does Castmark Press have on Amazon?
KDPTop tracks 9 of their books; 7 made an Amazon list in the last 30 days.
Which categories does Castmark Press publish in?
Their books chart most often in PMP Exam, Technical, Project Management.
How does Castmark Press price their books?
The median price is $17.47; half of the books cost $12.23–$22.48.
Has Castmark Press released new books recently?
4 new books in the last 30 days, 2 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.