There are usually a few cold air intakes for sale in the member marketplace here in the forum.
http://www.camaro5.com/forums/forumdisplay.php?f=30
you can check there first for a good deal usually. I got a great deal on mine recently. If you do get one used keep in mind that you may have to get a PCV hose for the crankcase vent if they don't have one to ship with the intake. You should be able to get one cut to whatever length you need at the local auto parts store.