KDP categories · Top KDP authors
D Armstrong: Amazon KDP author data
As of Nov 6, 2026, D Armstrong has 8 books on Amazon, 7 of them on a best-seller list in the last 30 days (best rank #7), mostly in XML, Windows Administration, Windows Servers.
| Median price | $3.49 |
|---|---|
| Price range (middle 50%) | $0.99 – $4.49 |
| Median reviews | 32 |
| Total reviews | 365 |
| New listings (30 days, incl. new editions) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- 88% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $3.49, 81% below the median of their main category, XML.
D Armstrong's best-ranked books
-
Learn XPath Fast: A beginner-friendly, exercise-based course for people who want to use XPath in Selenium, SQL Server, XQuery or anywhere else
by D Armstrong
- Price$5.99
- Rating4.4
- Reviews21
- Published2019-08
-
Learn Command Line and Batch Script Fast, Vol III: A course from the basics of Windows to the edge of networking
by D Armstrong
- Price$3.99
- Rating4.5
- Reviews59
-
XML and XML Namespaces: A primer for XPath
by D Armstrong
- Price$0.99
- Rating3.2
- Reviews5
- Published2019-08
-
Learn Command Line and Batch Script Fast, Vol II: A course from the basics of Windows to the edge of networking
by D Armstrong
- Price$3.99
- Rating4.3
- Reviews65
- Published2015-03
-
Learn Command Line and Batch Script Fast, Vol I: A course from the basics of Windows to the edge of networking
by D Armstrong
- Price$2.99
- Rating4.3
- Reviews146
- Published2015-03
-
Learn SQL Fast: SQL made simple! A beginner's guide to SQL, with practical exercises for Microsoft SQL Server
by D Armstrong
- Price$0.99
- Rating3.9
- Reviews13
-
Learn VBA Fast, Vol. III: Excel function design course, with practice exercises (The VBA Function Design Course Book 3)
by D Armstrong
- Price$0.99
- Rating4.3
- Reviews14
-
Learn Command Line and Batch Script Fast: A course from the basics of Windows to the edge of networking
by D Armstrong
- Price$21.99
- Rating4.1
- Reviews42
- Published2016-11
Main categories
FAQ
How many books does D Armstrong have on Amazon?
KDPTop tracks 8 of their books; 7 made an Amazon list in the last 30 days.
Which categories does D Armstrong publish in?
Their books chart most often in XML, Windows Administration, Windows Servers.
How does D Armstrong price their books?
The median price is $3.49; half of the books cost $0.99–$4.49.
Has D Armstrong 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.