Out of curiosity I internet searched around my locale (Raleigh-Durham-Chapel Hill, 'the triangle') and didn't really come up with any decent vendor unless you count Walgreens and the most basic e-cigs like Njoy or Blu. I was in Louisville recently and happened to drive by this store (Electric Ladyland) that advertised them on the front and while I didn't have time to stop, checked out their website and they offered two nice mods, a Lavatube and a Tesla.
So for me right now it's all internet purchases. This thread already has a few shops already mentioned that I'm going to check out now, but you really can't go too wrong with flavors by Mt. Baker Vapor or Vapor Chef, the two vendors I've ordered the most from thus far.