Even though I work for a retail parts house, I LOOOOVE finding non-traditional parts sources. Ace Hardware, McMaster-Carr, Aircraft Spruce, West Marine, and even Amazon have all supplied parts for my racecar. I consider NAPA a non-traditional source (for racing parts at least), and Moss a non-traditional source for Bentley parts. (Although that last is kind of a cheat since British makers all shared their sources.) NAPA and other American parts chains are still non-traditional when it comes to parts for British cars.
I also enjoy solving problems with the "wrong" part -- I found that Ford uses a door lock rod clip that nicely replaces the original brake line retaining clips that Tiga sourced from who knows where, and that drum brake return springs worked well to hold the exhaust collector to the header.