If the shop orders from Horizon Hobbies then they can get the GMA Powermaster. I just saw it this afternoon, looking over the shoulder of my LHS owner.
I just ordered a case from my LHS. The deal is that the hobby shop either has to pay haz-mat fees to UPS like you and me, or they have to get a pallet-load of fuel. So my LHS only orders fuel every month or two, when he runs low. If you can get a shop that can remember you for that long, or if you can catch them right when they order, then you're in like Flynn. (Says Tim, hoping that his local shop will remember to order the fuel...) My LHS happens to be very good about special-ordering stuff, as long as it comes from the distributors that he's signed up with.