After spending nearly an hour at my local Home Depot, and consulting numerous employees who all seemed to think that they didn't have what I was looking for I found the FRP sheets in the paneling section. I also found this useful little sheet with a bunch of part numbers for Glasliner Fiberglass Reinforced Panels.
http://i552.photobucket.com/albums/j...ame008/FRP.jpg
Hope this helps, hope it's readable, if you need any clarification feel free to shoot me an email at same0084.at.gmail.dot.com