I found a non-working GM1 cheap on Ebay. I've disassembled it and have identified the bad part, the shutter assembly. However, Panasonic does not list it in their parts list with the other items, and they can't seem to give me a part number / price / availability for it. Don't feel bad for me - I got an excellent deal on a working one too. I'd still like to get the broken one working though. And the GM1 was very easy to disassemble - I had no problem with it.