KDP categories · Top KDP authors
Space Marine (Military, Books): Amazon KDP category data
Amazon Books Best Sellers data for Space Marine (Military, Books), updated Nov 2, 2026: median price $5.99, median 834 reviews, average rating 4.5 and a KDPTop opportunity score of 31/100 (highly competitive).
| Price range (middle 50%) | $3.99 – $7.99 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 44% |
| Books on the list | 100 |
| Store | Books |
What stands out
- 44% of its best sellers came out in the last 90 days, more than in 99% of Books categories: readers here keep buying new titles.
- At $5.99 its median price is below 98% of Books categories, so it is a volume game.
- Its review barrier is higher than in 83% of Books categories: the median best seller has 834 reviews, so new books need time to build up.
Top 10 Space Marine best sellers
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Lieutenant Year 8 (An Officer of the Union Space Fleet)
by Joe Durham
- List rank#2
- Price$3.99
- Rating4.3
- Reviews102
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Tavalai Rebellion: (The Spiral Wars Book 11)
by Joel Shepherd
- List rank#4
- Price$5.99
- Rating4.7
- Reviews18
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Imperial Commander: Decline and Fall of the Galactic Empire Book 8
by Andrew Moriarty
- List rank#5
- Price$7.99
- Rating4.8
- Reviews31
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Ender's Game (The Ender Saga, 1)
- List rank#6
- Price$12.96
- Rating4.6
- Reviews45,944
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House of Blades: A Space Opera Epic (Gates of Babylon Book 1)
by Joshua Dalzelle
- List rank#7
- Price$8.99
- Rating4.6
- Reviews127
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Starship Ranger
by Reece Landon
- List rank#8
- Price$4.99
- Rating4.5
- Reviews295
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Ensign Year 1 (An Officer of the Union Space Fleet)
by Joe Durham
- List rank#9
- Price$2.99
- Rating4.4
- Reviews1,962
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Preemptive Action (The Last Hunter Book 17)
by J.N. Chaney
- List rank#10
- Price$6.99
- Rating4.7
- Reviews151
Same niche in Kindle eBooks: Space Marine
FAQ
Is Space Marine a good niche for Amazon KDP?
Its KDPTop opportunity score is 31/100, which makes it highly competitive. The median best seller has 834 reviews and sells for $5.99.
How many reviews do you need to rank in Space Marine?
The median best seller has 834 reviews, and 18% of them have fewer than 100.
What do Space Marine best sellers cost?
The median price is $5.99; half of the best sellers are priced between $3.99 and $7.99.
Can new books break into Space Marine?
44% 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.