... because so many people buy on price, there's pressure on the chandlers to make low-cost merchandise buying decisions. Too often, however, they don't carry the better stuff after a while because the cheap stuff sells. Merchandise "turn" is the name of the game for retailers to be profitable, so when it's time to narrow stock to the best sellers guess what's no longer on the shelves or in the inventory? The good stuff.
A few years ago I was browsing the stainless hardware section at a local WM and could not find the Wichard quicklinks I wanted. Plenty of Chinese stainless knock-off fittings in stock though. I ordered what I needed online, for not much more $.