At 25%, you might as well buy TF2 credits from this site for $10 per 90,000 credits:-
http://www.tf2wh.com/And then sell the credits at their sister-site (Note:- this site will be closing soon):-
http://www.tf2whx.com/That way you buy 1,000 credits at $0.11 and sell for (Current rate) 0.00016800, which, based on BitStamp is $0.1238, so, in fact, you gain a cent.
Although, obviously, this is sub-optimal. It requires you:-
1. To have a steam account
2. To be verified on TF2WH
3. To be willing to give your CC details to just 'some company'
4. Wait for someone to buy your credits at TF2WHX, on a
really inactive market (E.G. not good for large purchases)
But, hey ho, worth posting, I guess.