I don't think ANY store carries their ENTIRE line, but from speaking with them informally on the phone, they indicated that ACE Hardware and Sears are their two biggest clients. But I had to get one of their specialty lights on the net because neither store carried it. (It was the Ultima Xenon model with CCFL tube, in case you were wondering.)
While casually shopping, I have seen some at Wal*Mart, Home Depot, local supermarkets, and at some local camping/sporting goods stores.
Ed.