GOG.com - The Piñata Madness Sale
Hotline Miami (85% off), Titan Quest Anniversary Edition (80% off), The Age of Decadence (75% off), Armikrog (70% off), Heroes of Might and Magic III: Complete (66% off) and more! Buy special Piñata for $3.00 and get a game with a base price up to $44.99!
About Piñatas:
Pay $3.00 and get digital Piñata. Every Piñata holds a mystery game worth from $5.99 up to $44.99 (base price). Follow this thread on official GOG.com forums and see what kind of games you can get from Piñatas. According to the 2017 Pinata Madness FAQ, you won't get games you already have in your GOG library.