My sister is involved with a prom dress donation organization called the Perfect Prom Project, so I got a dress and earrings for free. Then I bought accessories (bracelets, stockings, and hairclips) at the dollar store - I even found cute bows to clip onto my heels to pull the outfit together. The best part of my outfit was my faux fur wrap that my mom found at the thrift store. The purse was the last thing I needed to stress about - I just used one I had already and no one really saw it. Not counting my hair, I spent maybe $35 max on the whole outfit.