At our local post office, and I imagine yours, there is an entry form for a contest related to TBL. You write a letter to your favorite contestant. There is a drawing and you can win trips to the finale, a week at the ranch, several months of food delivered to the house (my favorite prize). They are pushing health oriented stamps, and this is a tie in, but I don't think you need to buy the stamps.
Of course I'm having trouble deciding who my favorite is, since it isn't an especially inspiring group.