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Space Opera (Teens › Science Fiction, Books): Amazon KDP category data
Amazon Books Best Sellers data for Space Opera (Teens › Science Fiction, Books), updated Nov 2, 2026: median price $5.99, median 359 reviews, average rating 4.5 and a KDPTop opportunity score of 27/100 (highly competitive).
| Price range (middle 50%) | $2.99 – $14.66 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 14% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 4% of the parent category Science Fiction (8,600), one of the easier corners under it.
- At $5.99 its median price is below 98% of Books categories, so it is a volume game.
- 14% of its best sellers came out in the last 90 days, more than in 78% of Books categories: readers here keep buying new titles.
Top 10 Space Opera best sellers
-
I’m a Destroyer: A Sentient AI Warship Military Sci-Fi Adventure (I, Warship Book 1)
by Sean Robins
- List rank#1
- Price$0.99
- Rating4.4
- Reviews257
-
I’m a Liberator: A Sentient AI Warship’s Guide to Starting a Rebellion (I, Warship Book 2)
by Sean Robins
- List rank#2
- Price$2.99
- Rating4.3
- Reviews105
-
Ender's Game (The Ender Saga, 1)
- List rank#3
- Price$12.96
- Rating4.6
- Reviews45,944
-
Defiant
- List rank#4
- Price$19.75
- Rating4.6
- Reviews8,095
-
I’m a Conqueror: A Military Space Opera of War, Rebellion, and Conquest (I, Warship Book 3)
by Sean Robins
- List rank#5
- Price$3.99
- Rating4.3
- Reviews50
-
I'm a Weapon : A Combat Robot Military Sci-Fi Adventure (I, Anomaly Book 1)
by Sean Robins
- List rank#6
- Price$0.99
- Rating4.5
- Reviews356
-
I’m a Survivor: A Humorous, Action-Packed Military Sci-Fi Space Opera Adventure (I, Warship Book 4)
by Sean Robins
- List rank#7
- Price$3.99
- Rating4.3
- Reviews22
-
I'm Prey: A Hunted Sentient Warship in a Military Sci-Fi Thriller (I, Warship Book 5)
by Sean Robins
- List rank#8
- Price$3.99
- Rating4.6
- Reviews38
-
I'm Vengeance : An Epic Military Sci-Fi Adventure of Rebellion, Revenge, and Galactic War (I, Warship Book 6)
by Sean Robins
- List rank#9
- Price$4.99
- Rating5.0
- Reviews1
-
Suspended in the Stars (Xerus Galaxy Saga Book 1)
by E. A. Hendryx
- List rank#10
- Price$0.99
- Rating4.6
- Reviews118
FAQ
Is Space Opera a good niche for Amazon KDP?
Its KDPTop opportunity score is 27/100, which makes it highly competitive. The median best seller has 359 reviews and sells for $5.99.
How many reviews do you need to rank in Space Opera?
The median best seller has 359 reviews, and 26% of them have fewer than 100.
What do Space Opera best sellers cost?
The median price is $5.99; half of the best sellers are priced between $2.99 and $14.66.
Can new books break into Space Opera?
14% 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.