I can't think of any store that caters to this specific type of thing. And now that you mention it, it's a real shame. Neiman Marcus and Nordstrom sell a lot of Veblen goods, not necessarily actual high-end anything.

Costco sells actual high-end products, but they're very limited in their selection. For various products, people in the know don't use them. However, for example, flashlights they sell from Duracell are stronger than anything you can pickup from Home Depot, curiously.