Although it wasn't his first series, the Domesday Book series was the first of Edward Marston's many series that I read, and it's still my favorite of his. The titles have been hard to get in e-book until recently, when it appears he may have gotten the rights back to some/all of them, and they've been coming out from Allison & Busby. Now the third title in the series,
The Dragons of Archenfield, has dropped to £1.99 at Kindle UK. As of now, it hasn't dropped in the US.
Kindle UK:
https://www.amazon.co.uk/gp/product/B082P93VFP/
Kindle UK/Smile:
https://smile.amazon.co.uk/gp/product/B082P93VFP/
The first title in this series,
The Wolves of Savernake, was on sale a little while ago, and it's still available at a pretty good price (£1.49) in the UK, although no longer on sale in the US. It's also KU in both countries, although be forewarned that the rest of the series isn't. Info and links in this previous post:
https://www.mobileread.com/forums/sh....php?p=4029323