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Bertie Stephens: Amazon KDP author data
As of Nov 6, 2026, Bertie Stephens has 3 books on Amazon, 3 of them on a best-seller list in the last 30 days (best rank #1), mostly in Environment, Environment & Ecology, Science, Nature & How It Works.
| Median price | $4.99 |
|---|---|
| Price range (middle 50%) | $2.99 – $12.41 |
| Median reviews | 837 |
| Total reviews | 1,739 |
| New books (30 days) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- Median price $4.99, 17% below the median of their main category, Environment.
Bertie Stephens's best-ranked books
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Ellie Ment and the Material Matter: Book 1
by Bertie Stephens
- Price$0.99
- Rating4.4
- Reviews838
-
Ellie Ment and the Material Matter
by Bertie Stephens
- Price$19.84
- Rating4.4
- Reviews838
-
Ellie Ment and the Passage to Glenmorgan: Book 2
by Bertie Stephens
- Price$4.99
- Rating4.9
- Reviews65
Main categories
FAQ
How many books does Bertie Stephens have on Amazon?
KDPTop tracks 3 of their books; 3 made an Amazon list in the last 30 days.
Which categories does Bertie Stephens publish in?
Their books chart most often in Environment, Environment & Ecology, Science, Nature & How It Works.
How does Bertie Stephens price their books?
The median price is $4.99; half of the books cost $2.99–$12.41.
Has Bertie Stephens released new books recently?
0 new books in the last 30 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.