This just came up at my favorite on-line tech outlet sites. $58 + S&H http://www.compgeeks.com/details.asp?invtid=203C-50MW-N Camera Dimensions: 0.75 x 0.75 x 0.50-inches (H x W x D, approximate) Runs on a 9v battery. Complete with receiver. Merry Christmas everyone!
There is something like this being advertised in the current N Scale Railroading. I saw that the camera lens was .020 inches in diameter.