ebay can create some pretty good saved searches. Separate terms with commas and put them in a parentheses, and it'll find any of them. add a minus before a term and it'll exclude those. filter by size and price range and you're good. mine:
(selvage,selvedge,apc,evisu,RRL,nudie,5ep,raw denim,self-edge,flathead,iron heart,uniqlo,5ep,imperial) -(g*star, gstar, g-star, diesel)
in men's jeans
filtered by <$200 and waist <28.
save it as a favorite search, have ebay email you when new matching stuff pops up
usually catches stuff pretty well. the exclusion function is at least as useful as the search function- when you can get rid of the shitty chinese knock-offs, mall brands, and other trash on the 'bay, you'd be surprised what pops up.