T.F.
I love White House Black Market. Not cheap and does not look cheap but pretty reasonable. I love the clothes I get here. Nice dresses too. Right now they are having a sale.
Ann Taylor Loft is usually reasonable
Dillards, Macy's, Nordstrom, etc.
Buy something that is going to last you and you end up saving money in the long run. If you find a cheap skirt, top... you might only get to wear it a few times before it looks worn and then you are out the same amount of $$ to get something again.
I'd get classic black slacks and skirt and put nice tops with them.
Good luck!!