And today's Open Road "author of the day" (actually from Ipso books, who seem to be affiliated in some way with Open Road, since their books show up in Open Road marketing emails) is Margery Allingham, with 11 titles in her Albert Campion series at $2.99 (and one otherwise at $1.99) at Kindle US. Not on sale, for now, at Kobo US, but I'm giving the link for price check purposes...
Kindle US:
https://www.amazon.com/gp/search/?se...price-asc-rank
Kobo US (for price check):
https://www.kobo.com/us/en/search?Qu...cmaxprice=2.99
So if you are missing a Campion or two, check it out...
EDIT: Use caution - a number of these seem to be re-released editions, and don't show up as previously purchased, so check carefully before you buy...