T-Mobile has a web deal for a few 4G phones and the Nokia Lumia 710 (with 126 reviews and 5/5 stars) can be your for free with a 2 year contract or you can get a Sideick4G for free as well. These deals end midnight PDT on 2/7 and there are a few other free deals that go longer.
Check out the deals here but if you were looking for one of these phones, it’s hard to beat free. Note their footnote is “New activation and 2-yr. agmt. on qualifying plan req’d. Not available in retail stores.” so check the fine print before checking out.