This is really more horror so I'll post in that thread as well, but there's some dark fantasy and creepy speculative from World Fantasy Award nominees included, so:
Until October 31st, Chizine Publications are holding 50% off selected dark fantasy/horror collections and novels when you direct-buy. Many of the titles have blurb praise from Ellen Datlow, Cory Doctorow, and Locus and other magazines.
Discount is automatic and no coupon is needed; most titles work out to $5. Outside their own webstore and Weightless Books, CZP are distributed by HarperCollins in most outlets and the titles I spot-checked were priced around $11.10 CAD when I looked in the Kindle store.
They've overhauled their website since last I shopped there and the store login links are no longer obvious, but you should still get a DRM-free bundle of ePub/Mobi/PDF, though there may now be site backup/re-download limitations.
CZP have a blogpost with a list of links to the eligible titles, but there's no obvious way to link to just that, so you'll have to scroll down to the
Oct 20th Halloween Sale announcement on their frontpage.
Sale titles are:
Every House is Haunted by Ian Rogers
Eutopia by David Nickle
Enter, Night by Michael Rowe (Lambda Literary and Spectrum Award-winning author)
Horror Story and Other Horror Stories by Robert Boyczuk
Hair Side, Flesh Side by Helen Marshall
The Hair Wreath and Other Stories by Halli Villegas
Monstrous Affections by David Nickle (Black Quill Award winner)
Picking Up the Ghost by Tone Milazzo
Stories from the Plague Years by Michael Marano (contains a Shirley Jackson Award nominee novella)
Remember Why You Fear Me by Robert Shearman (World Fantasy, British Fantasy, and Shirley Jackson Award-winning author; blurb says this collects his best reprint tales + 10 previously uncollected stories)
The World More Full of Weeping by Robert J. Wiersema
If you're strapped for cash around this time of the year, CZP has in the past held a more general 50% off almost everything sale on Black Friday if you think you can wait and see.