Any suggestion for an online store that sells HIGH quality costumes ($300-$800) NOT kiddie halloween, polyester jumpsuits?

Im into getting really good costumes that people would stop and stare…not big, baggy, crooked, velcro, jumpsuits that look like junk. We all know the feeling of trying to look like batman with a front-only maks that has an elastic band that always snaps, and a suit with the belt painted on. Where can I find semi-affordable (i say that because MOST people would think $300—$800 is extreme) costumes that DESERVE to be priced as such? It seems there would be a huge market for this type of thing for parties (iron man, batman, video-game characters, etc.) but the reality is, Im having trouble finding anything that isnt home made on ebay and way over-priced because of it ($2000 for a chest-plate! come on!) lol. Any suggestions? Thanks!!