I was on the Yahoo Auction site and ran across this Color Spy Camera that was up for auction. Looks like it would work for Largescale just fine. Small and compact camera, uses 9 volt battery and for only $10.00 including the receiver. Range around 100-300 feet.
Check it out and if someone buys one, please report back on the performance.
http://page.auctions.shopping.yahoo.com/auction/75819160?aucview=0x13