http://cgi.ebay.com/Set-of-15-Xbox-3...QQcmdZViewItem
This guy has fifteen faceplates for sale for $150 plus $20 shipping.
The bad: He has one bad feedback as a seller and one as a buyer with only about fifty total feedback. So that would raise a red flag with me. He does take PayPal so you can document receipt of payment.
The good: There's an odd selection of plates here. Zero Hour is probably the only one worth more than $50, but he does have two of the Madden 2007 which are kinda rare, and a FEAR plate, which is not cheap either. Plus there's a Blue Dragon and a Gamestop Clancy plate. But the weird one is the LOTR Eye of Sauron plate, which I've never seen before.