A
page at Subterranean Press's website says their sale will run through September. If you visit
the ebook list at their website and click through to any title, there are links to that title for Kobo as well as Amazon and BN.
I've read some of Elizabeth Bear's steampunk-y vampire detective novels/collections (the first being
New Amsterdam), which might appeal to some historical mystery readers as well. I liked rather than loved the books, but steampunk and vampires aren't particular interests of mine, and I thought Bear writes well.