TheOtherDev Productions has a 50% off sale on all their PDFs for Pride Month, with 10% going to a local charity. I know them for their Norse golem Iron Edda stuff which is for Fate, but they also have stuff for other genres and systems like Powered by the Apocalypse.
While not technically a sale, Neoplastic Press's newest book, Mystery Monsters, is a FREE offering that's definitely worth checking out! Each of the twelve new (and rather gruesome) monsters has no stats, but instead comes with a puzzle for players to solve.
Please note my use of affiliate links in this post.
I'm expecting another big shipment of used rpg books next week, and am having another sale to make room for the new listings. Take 25% off all used books with the code "Clearance03" at checkout. Products | Third Kingdom Games
Lights, Camera, Action sale. Movie and TV based-RPG PDFs, up to 33% off for about two weeks. Examples such as Alien, Dune, Labyrinth, My Little Pony, Dark Crystal, Judge Dredd, Doctor Who, Witcher, Star Trek, The One Ring (Lord of the Rings), among others.