A bunch more Open Road titles are $1.99 at Kindle US. Not at Kobo US, as far as I spot price-checked. Some are repeat sale/freebies, but some were new on sale to me, at least. Here are titles and links:
The Crooked Wreath, apa
Suddenly at His Residence, is the 3rd in the Inspector Cockrill series by Christianna Brand
link:
https://www.amazon.com/Crooked-Wreat...dp/B005XE5BHK/
The Grub-and-Stakers House a Haunt is the fifth in the Dittany and Osbert Monk series by Charlotte MacLeod
link:
https://www.amazon.com/Grub-Stakers-...dp/B009S33KAC/
Lieberman's Day is the 3rd in the Abe Lieberman series by Stuart M. Kaminsky
link:
https://www.amazon.com/Liebermans-Da...dp/B00AYRI5NS/
Blood and Rubles is the 10th in the Inspector Porfiry Rostnikov series by Stuart M. Kaminsky
link:
https://www.amazon.com/Rubles-Inspec...dp/B009H70LJW/
The Vulgar Boatman, Brady Coyne, #6, by William G. Tapply
link:
https://www.amazon.com/Vulgar-Boatma...dp/B00DZ4GTIK/
Cirak's Daughter is a non-series title by Charlotte MacLeod, oddly enough not listed at
SYKM...
link:
https://www.amazon.com/Ciraks-Daught...dp/B06ZYHH7Q5/
Bloodfire is the 5th in the Fred Carver series by John Lutz
link:
https://www.amazon.com/Bloodfire-Fre...dp/B0053E4TOG/