https://www.humblebundle.com/e3-digital-ticket
The bundle is mostly add-ons for F2P games, with the two big things (read: not add-ons for F2P games) in it being Psychonauts at the "pay whatever you want tier" and the Monster Hunter Generations demo code at the $4 tier.
And now I'm going to stoop low and codebeg: if anybody has a spare Monster Hunter demo key, I'd happily take it.