I think if a few different people would offer to host mirrors of bandiwidth-heavy files, such as last days mod or whatever, it'd take a load off your bill.
For example, when you go download the file you get
mirror1
mirror2
m&b depository
They could add a BW limit(something reasonable) after that the mirror closes, if it's closed they'd go to the next, and the next, etc until reaching yours.
There's a lot of people out there with ~100gb a month plants who use 1, or 2. You get my drift.
Sadly, I am not one of them, otherwise I'd mirror some of your stuff.