It is through a company called Progressive Financing, and it is a program they have rolled out to a lot of Metro PCS authorized dealers. You put down 10% then set up payments on your payday to ACH debit from your bank account. The application process took about 30 minutes and it does work. They have about an 80-85% approval rate. No credit check, just checking your bank to make sure you don't have a lot of NSF or overdrafts. Hello Unlimited wireless in Riverview is doing it, as well as the one on Kingsway in Brandon. The one by my house is as well. It is the Metro PCS store on Fowler in the Winn Dixie plaza where Fowler & 301 merge, right across from the Big Top Flea Market. They still seem to have plenty of S3's in stock.
Best of luck and let me know how it goes!
PS - Here is a link to another store on 56th Street doing it:
METRO PCS IS NOW DOING NO CREDIT CHECK FINANCING ON PHONES!!!
EDIT: No, I am not a dealer, just wanted to spread the word on this because I know how many people want these new phones but can't afford the cost all at once.