theres a shop in the mall near my house that does that. I think they have a website, if you want i can see if i can get it for you. Oh and they already have three of them that they flashed to metro and boost.
Current Phone:Samsung Galaxy S3 i9300, Galaxy SIII ATT...Galaxy nexus maguro...Galaxy S2 epic touch...=D
Old phones:Atrix 4G,Samsung Captivate,Blackberry9700.