While Steam may have changed the way they handle their sales now, with daily deals and flash sales being gone, GoG on the other hand still embraces that format and is back with another Winter Sale.
You got everything from bundles, to 48 hour deals, to individual sales. It even has a $3.00 mystery game. The cool thing about that is that the game could be valued anywhere between $9.99 and $34.99. While it says that games you don't own will be prioritized, it's still crappy that you could potentially get something you already own. But hey, it's a neat experiment, and I wonder how many people will jump on this.
You can check out the whole sale right here.