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good question.. xD

Current humble bundle (released 3h ago) has 4x risk of rain in the bta, they expire if not used untill the 25/11.
http://humblebundle.com/

Its in the humble bundle - you get a 4 pack

Humble Bundle second tier has a 4 pack included for the game

It's in the new Humble Bundle as a four pack.

It's in the new Humble Bundle as a four pack.

Humble Indie Bundle 13. ;)

New humble bundle, if you beat the average you get 4 copies of it. One for you and 3 to share

You get 4 copies of Risk of Rain if you pay 5.95$ or more in the new HumbleBundle.