No discs in any convenience store or Walgreens or any drug stores in the Charlotte area. 3 stores I can think of,
Dicks-Overpriced by a couple bucks, very small selection(8 molds max in DX, 3 in champion if you're lucky)
Infinity's End(Head Shop)-I hear they have a decent selection and the prices beat Dicks, but not by much. I haven't needed to go here so I don't have any personal experience with the place.
Play It Again Sports-definatly the best selection in town, with a great selection of Innova and a fair amount of Discraft. Also carries used discs for close to half the price of new discs(selection varies or course, based on customers selling their used plastic)