Bonus backlist historical romance freebie: Jo Ann Ferguson is a formerly Zebra (Kensington) author, with about 2 dozen paperbacks coming up when her name is searched in the print store.
My Lord Viking is apparently not a Zebra-published romance, but a 2001 paperback from Imajinn Books, who offered us a bunch of freebies for Read an E-Book Week this year, mostly more romance and paranormal/fantasy/thriller-looking.
Imajinn themselves have made many more of their books temporarily free via KDP (I kind of wonder how that's going to affect their webstore, where they were selling their catalogue directly).
If you happened to like their RAEBW offerings, you can grab even more of the publisher's backlist via
this search link here which sorts them low-to-high (mostly).
ETA: Selena Kitt, a mostly-erotica author who has
co-authored one of the Blake Crouch books in the other thread, has several of her eXcessiva-published erotica stories (some classical mythology-based, if that happens to be your kink) KDP select-freebied.
They are normally priced at $3.99 and
this search link will show all her works, sorted low to high.