It all depends on your local Market.
Here in Northeast Pennsylvannia I have the opposite problem. I went to 5 dealers for RM80 rear brake pads and a Honda CR250 master cylinder rebuild kit and found none, had to mail order. As for KTM my local dealer is small and stocks the maintance stuff and if I tell him by tuesday I need something I have it for Friday or Saturday otherwise I have 4 other great KTM dealers within 100 miles that will do the same (get me to the race on sunday).
I have found that the local smaller KTM dealers that maintain an interest in the local race circuit seem to be the best to deal with. Some larger multi line dealers that cater to the sport bike/ATV market have poor parts selection for the average off road racer.