Costco!
I have purchased lamps, couches, outdoor furniture, desks, etc….
Echo Revival for rugs. Good prices for vintage/lifetime pieces.
And I’m not going to lie, Craigslist has done me well particularly if I scroll for a specific brand. I have bought multiple Roche pieces from there, as well as (previously owned) custom bunks and a gorgeous master bedroom set. The time investment can be substantial though.
Have not been impressed by long term quality of restoration hardware.