panels or lap type siding?
Try www.outwater.com (Outwater Plastics) Look for Faux Stone Panels under Wall Coverings catagory. I like theirs because they are interlocking design, whereas Lowes/Home Depots are all square sided, and you can see the seams where each panel connects to each other. The have lots of cool items like rope lighting, moldings, Stair parts, kitchen storage etc. Here is a direct link: