A Killzone 3 tournament presented by Virgin Gaming and Edge shaving gel (yeah, I think it's a weird choice for product cross-promotion too) has a prize pool of $40k, and you could be picking up a good sized chunk of it with two of your buddies. The tournament is structed as 3vs3, with qualifying rounds opening Monday, June 27.
From there, 32 teams will compete in elimination rounds. The last team standing gets to claim $10,000, though how they choose to split it is for them to decide. The other 19 teams which comprise the top 20 will also receive prize money, but those amounts haven't been specified.