Hey guys and gals, I'm looking to purchase a Droid 4 and currently have a Thunderbolt. I have a 2 year upgrade available due to my family plan and would like to use it. Problem is I don't know the best route to take in buying a Droid 4. I would to find one at a good price and have no problem trading in or selling my thunderbolt to use as money for it. Anyone know any good sites or ways to go about buying it? Thanks for any help ahead of time.