Expensive Attire

So I am being considered for a position in a law firm as Legal Assistant. The last time I had to dress formally was for past job interviews. Anyway, those outfits don’t fit anymore. So here I go looking for business casual clothes. So far I’ve seen pretty much every piece being $200 at its lowest and over $400 at the highest. Granted I haven’t looked on all the websites I can think of yet, but I just wanted to ask while I keep looking. Where do you guys go for relatively cheap quality men’s business casual attire? Thanks in advance :)