GOG.com Special Charity Promo

Link

Pick 3 Games.
Donate $5.
100% Goes to Charity!

List of participating games:
DRIFTMOON
DARWINIA
ODDWORLD: ABE'S ODDYSEE
WAKING MARS
BOTANICULA
INCREDIPEDE
FTL: FASTER THAN LIGHT
WHISPERED WORLD, THE
PID
CREATURES VILLAGE

Very easy and relatively cheap (every game costs 1/3 of $5 = $1.67) to add more than 3 games.
It is PWYW as well, so you can pay more than the minimum
GOG is shelling out their own money for the transactions fees, this is costing them money so that 100% of your donation goes to charity