Holy shit I'm late to the game here! For the next uh...five and a half hours, everything I have to offer is 50% off over on Itch.io! That's twelve books for under $30! I'd love to be able to raise at least $100 from the sale, so be sure to share it around! 
Note that this includes all five Post-Self books, so if you've been looking for an excuse to get into the series for $2.50 or the whole thing for $12.50 all told, this is your chance :D