KDP categories · Top KDP authors
M. J. Ryker: Amazon KDP author data
As of Nov 6, 2026, M. J. Ryker has 2 books on Amazon, 2 of them on a best-seller list in the last 30 days (best rank #5), mostly in Engineering & Transportation, Networking & Cloud Computing, Engineering.
| Median price | $4.99 |
|---|---|
| Price range (middle 50%) | $3.99 – $5.99 |
| Median reviews | 3 |
| Total reviews | 6 |
| New books (30 days) | 2 |
| Breakout books (30 days) | 1 |
What stands out
- Median price $4.99, 71% below the median of their main category, Engineering & Transportation.
M. J. Ryker's best-ranked books
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The Baofeng UV-5R Survival Field Guide: Programming, Repeaters, Antennas and Off-Grid Power — Stay in Contact When the Grid Goes Down
by M. J. Ryker
- Price$6.99
- Rating4.2
- Reviews3
-
The Baofeng UV-5R Survival Field Guide: Programming, Repeaters, Antennas and Off-Grid Power — Stay in Contact When the Grid Goes Down
by M. J. Ryker
- Price$2.99
- Rating4.2
- Reviews3
Main categories
FAQ
How many books does M. J. Ryker have on Amazon?
KDPTop tracks 2 of their books; 2 made an Amazon list in the last 30 days.
Which categories does M. J. Ryker publish in?
Their books chart most often in Engineering & Transportation, Networking & Cloud Computing, Engineering.
How does M. J. Ryker price their books?
The median price is $4.99; half of the books cost $3.99–$5.99.
Has M. J. Ryker released new books recently?
2 new books in the last 30 days, 1 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.