I’ve read and liked most of the titles in Jeri Westerson’s Crispin Guest medieval mystery series, which used to be pretty reasonably priced years ago, but are pretty expensive these days – mostly $9.99 and up. But two of the early books are on sale in the US for $2.99 each right now.
The Demon’s Parchment, #3
Buy at Kindle US | Kobo US (discountable!)
Troubled Bones, #4
Buy at Kindle US | Kobo US (discountable!)
Remember that reusable coupon code “Partners22” is still working (at least, I used it yesterday) for 40% off, but you have to check out one book in a cart at a time.
Cup of Blood is the seventh book published in the series, but is a prequel. It’s $0.99/£0.89 in the US/UK right now, but it’s discountable at Kobo US, where code “Partners22” is still working for 40% off…
Kindle US: https://www.amazon.com/dp/B00KI1R0RW
Kobo US: https://www.kobo.com/us/en/ebook/cup-of-blood-a-crispin-guest-medieval-noir-prequel
Kindle UK: https://www.amazon.co.uk/dp/B00KI1R0RW
Troubled Bones is $2.99 again at Kindle US, but sadly not on sale, at least as of now, at Kobo US. The link in the OP is still good.
And the fifth book in the Crispin Guest series, Blood Lance, is also $2.99 at Kindle US, but not at Kobo US.
Kindle US: https://www.amazon.com/dp/B07ZV3NG1W
And finally, the prequel, Cup of Blood, is still nicely priced at $0.99/£0.85 in the US/UK, and discountable at Kobo US. The links in the comment just above are still good.