Users of the budget carrier, MetroPCS may be pleased to know that in October they will be able to get the Samsung Galaxy S III on their network. The most notable thing about MetroPCS is that they have plans to offer VoLTE service. Additionally, they are a prepaid service, so the phones on their network are non-contract. Of course, that means that you will have to purchase the phone for its full retail price without any kind of subsidy. That will likely be in the $500-600 range, but no official pricing has been given. This news is officially confirmed from both Samsung and the carrier so it is a for sure thing and not a rumor. We will keep you apprised with more details as the emerge.
Here's a link to the carrier's website: http://www.metropcs.com/metro/static/galaxySIII.jsp
Source: S3Forums via AndroidAuthority