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Space Marine (Military, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Space Marine (Military, Kindle eBooks), updated Nov 2, 2026: median price $5.99, median 716 reviews, average rating 4.5 and a KDPTop opportunity score of 31/100 (highly competitive).
| Price range (middle 50%) | $4.99 – $6.24 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 41% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- 41% of its best sellers came out in the last 90 days, more than in 98% of Kindle eBooks categories: readers here keep buying new titles.
- Its review barrier is higher than in 84% of Kindle eBooks categories: the median best seller has 716 reviews, so new books need time to build up.
Top 10 Space Marine best sellers
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Tavalai Rebellion: (The Spiral Wars Book 11)
by Joel Shepherd
- List rank#2
- Price$5.99
- Rating4.7
- Reviews18
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House of Blades: A Space Opera Epic (Gates of Babylon Book 1)
by Joshua Dalzelle
- List rank#3
- Price$8.99
- Rating4.6
- Reviews127
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Starship Ranger
by Reece Landon
- List rank#4
- Price$4.99
- Rating4.5
- Reviews295
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Shattered Starship
- List rank#6
- Price$0.99
- Rating4.3
- Reviews293
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An Ancient Light (Backyard Starship Book 34)
by J.N. Chaney
- List rank#7
- Price$7.99
- Rating4.8
- Reviews1,678
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Dead Guns: A Military Sci-Fi Adventure (Old Guns Book 4)
by J.N. Chaney
- List rank#8
- Price$5.99
- Rating4.7
- Reviews39
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Undercover Starship
- List rank#9
- Price$4.99
- Rating4.2
- Reviews731
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Galactic Forge (Shattered Starship Book 2)
- List rank#10
- Price$4.99
- Rating4.4
- Reviews80
Same niche in Books: 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 716 reviews and sells for $5.99.
How many reviews do you need to rank in Space Marine?
The median best seller has 716 reviews, and 17% 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 $4.99 and $6.24.
Can new books break into Space Marine?
41% 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.