There's a surplus store in Garland, Texas called "B.G. Microelectronics". A couple of years ago they had a modest supply of 8-watt polycrystaline panels for $20 each. A friend and I bought several of these, and they tested good. The cells were bonded to a fairly thick aluminum plate, which might keep them from overheating so readily as some. There was a red silcone rubber gasket around the front, and a pattern of holes for an outer frame, but no cover glass. I was told that these were salvaged from remote oilfield logging equipment. I don't know if they still get them from time to time, but their phone number is 1-800-276-2206. They have a catalog, but it's out-of-date as soon as it's printed because they're always getting in new stuff. You have to call or stop by. Stopping by is sometimes fun, they had a real cutie working there.