I have a fleetside rollpan that I bought from airbagit.com way back in like 2009. Another project I just never got around to doing. It is painted to match my truck, but a new one would come without paint, so either way you'll need to get it painted.
It can be bought new from them for $130 bucks so I'll say $60 (plus S&H). I'd prefer not to ship it, but if you really want it, I can get a few quotes and see what it would be.
Link to new one: Airbagit Steel Rollpans