Here's a really cool search engine for Craig's List, Ebay and Amazon; I usually uncheck the Ebay box as I'm just interested in CL, I search the others separately. Just type in HUMMER H2 skid plate and it will bring up all the CL's across the spectrum.
One listing is in the Tampa Bay area, but I found several ranging from $150-250 plus shipping depending on what you want--painted, chrome or stock.
It takes a little screwing around with this search engine, but it'll help you find what you need. Good luck.....
http://www.searchtempest.com/