If you wanted the new HTC Radar 4G on T-Mobile (and it is a pretty sweet phone, we have one in our hands as we speak), you'll want to take a look at getting it through Wirefly. They have it for the low-low price of $49.99 for either new service, new line or your upgrade, should you have one waiting.
To put that price in perspective, T-Mobile-direct advertises the device as $99 with a new contract, but alas, it's actually $150 with a $50 mail-in-rebate. We say "boo" to those and would rather just pay $50 direct to Wirefly and call it a day.
We'll have a review up of the Radar 4G in a few days, but so far we're impressed with the device--solid build, beautiful screen and fast. Shame about that 8GB of storage though.