Today's Weightless Books weekly 1-day sale for Dec 18th is for 50% off all titles published by Prime Books (mostly regularly $6.99, DRM-free choice of ePub/Mobi/PDF available worldwide):
Linkage for the lot of Prime's catalogue, discount is automagically applied in the cart.
There's a bunch of Horton-edited Year's Best anthologies in there, as well as best-of Lightspeed Magazine collections, and also plenty of collections and novels by well-respected authors and editors such as Ellen Datlow, Gardner Dozois, Liz Williams, Ekaterina Sedia, Elizabeth Bear, John Joseph Adams, et al.