If they're being intentionally obtuse, why not just order directly from the source? You may not get any special discounts, but the publisher makes a significant percentage more on the purchase than they do if you buy it through a gaming store.
Show me a game store that not only carries but is knowledgeable enough to sell 3rd party stuff and I'll gladly give them my business. If their selection is lacking and they can't discuss stuff from these companies intelligently, I'll buy online with no regrets. I'm lucky that I have a very well rounded and knowledgeable FLGS locally, and I don't mind throwing them some cash from time to time. In fact, I was actually going to give Goodman's Castle Whiterock a miss because of the price, but when I found out the store had recently been robbed, I intentionally went there and bought their most expensive OGL product, which just happened to be Castle Whiterock.