I just discovered IndieBox
today, and it's a pretty neat service that you may want to check out.
It's similar to LootCrate, where they send you something random in the mail each month, but this service has its own unique spin on it--they send you full games made by independent developers. Additional contents include the box, a physical copy of the game (including a Steam key), the game manual, the soundtrack, and other additional merch relating to the game.
Here's a review if you wish to see what it's like.