I realize that a lot of people won't buy from B&N anymore but here's a search to find the
HarperCollins 99 cent books. From there, you can check the genres you're interested in. There are a lot of PD works there, but in the SF/Fantasy, there are a number of the David G. Hartwell Best SF/Fantasy of the year collections, a couple of Bradbury short story collections, Sherri Tepper, Raymond Feist, Kim Harrison, Kevin Anderson & more.