I think our retailing model is part of the problem in the U.S. HD, Lowe's, Wal-Mart, Target for example will never stock anything that doesn't sell in quantity, and the Ace stores are independently owned, so if the owner wants to dedicate a quarter of his floorspace to the Big Green Egg, he can.
If I owned an Ace Hardware store I'd never carry anything black if it was a model the big box stores carry. Why bother, right? Just colors.
There aren't really any specialty "grilling" stores, just whatever the hardware or outdoor/landscaping store might offer.