It is in Raleigh near Meredith and is called Raleigh Brewery. In addition to the brewery, they sell commercial brewing equipment and late last week they announced that they would be opening a HB store inside the brewery too.
As for the different HB stores around, I can't say I've had a bad...
Try your local homebrew store and it they don't have any you may want to head to American Brewmasters in Raleigh.
I bought 4 from the guy on CL that had a 100 of them and in the end it would have been cheaper to have bought from American Brewmasters. The things were caked in in syrup and took...
I have a friend that ordered a kegerator from an online company (whom I won't mention) and it came in severely damaged. The company agreed to send him another which was the correct thing to do.
When the second one arrived, his wife happened to look out the window and saw the FedEx delivery...
As has been said, American Brewmasters in Raleigh, Metro Fire & Safety in Durham or Aviator Brewing in Fuquay. Aviator just recently began filling tanks so I haven't used them yet but it's a great excuse now to get to the brewery. All will fill tanks so no exchange needed.