GURPS is 33 years old!! All #GURPS PDFs through 2018 are 33% off - Sept. 23-Oct. 4, 2019! Thanks to its flexibility, quality writing, and ease of use, GURPS has been the premiere universal #RPG for over 3 decades! #PlaySJGames https://t.co/HawWeEZeEJ— Steve Jackson Games (@SJGames) September 25, 2019
So most of my books are part of this sale.