Good old games started their fall sale. They mostly specialize in selling old games in tweaked forms ready to run painlessly on modern systems, but not exclusively - they’ve got a mix of some of the newer games on there too. They’re good people, and it’s all DRM and hassle free.
They’re giving away a copy of the excellent Witcher 2 if you go to their store page, log in, and click the stamp collecting thing. You have to do it 7 times in a week, 6 hours apart. They’re also giving away Mount and Blade for free, but if you’re really interested in it, grab Warband sometime when it’s $5, because it has everything the original M&B has, but better.
They have a series of flash sales that, by the looks of it, change every 6 hours. So check it frequently.
I’m sure steam will have a black friday sale, and origin and the others probably will too, but since GOG was the first, I figured I’d get this thread going.