Perhaps not strictly a bargain, but I noticed a new title from Subterranean Press, The Best of Kage Baker (link to extended description
The Best of Kage Baker is a treasure trove that gathers together twenty stories and novellas, eleven of which have never been collected anywhere.
Baker is best known for her Company series involving time travel, but also wrote in other SF subgenres. This collection includes both Company and other stories including Hugo-nominated work. I've got four of her collections and novels sitting on my physical shelves, and I'm glad to acquire more for $5.
Barnes & Noble