I normally don't like going to antique shops because 'antique' usually translates into '$$$' but this place is not that at all. Depending on the item, I saw things range from $4, into the thousands. But I felt like nothing was overpriced and even bought some things. This store is A LOT of fun; even if you aren't buying anything it's seriously so much fun to just look at all the old things.
My only suggestion is wear comfortable shoes and try to go a couple of hours before closing time. This place is HUGE and every area is filled with hundreds of items. You will walk a lot and every step will be worth it LOL. And I say get there early not because they'll kick you out right at closing time (because they won't), but as a courtesy to them! :)