A pretty large portion of the kits, components, and pre-built boards are from "obscure" Chinese companies already, so much of what you'd want is just sort of... there. As a single example, get a GMK67 for $35, 70 Milky Yellow switches (if you're into linears. I am not.) for $20, and maybe a YMDK set of keycaps for $30-$50, and you've got a very presentable budget build under a hundred bucks. If you go hunting, you can probably find stuff you'd like just as much for even cheaper.