Homebuilt Rov Forum

http://www.raidentech.com/72p-100a-flashlight-cam.html

this one is pretty cheap and looks like it would be a easy mod also

http://www.raidentech.com/lyd-cm201-cwas-camera.html

They look rather handy, I prefer the second RCA spy camera partly because I don't think you shall get very far over a USB cable.
I am looking into using a bird box camera, similar to the second one:

http://www.amazon.co.uk/HEDGEHOG-CAMERA ... 690&sr=8-2

This is a complete kit with the RCA cable in a 30m length, but you can also get a single camera unit for about £5 ($8) which I have used in the past and found to be very good.

We are using a small board camera connected to a pair of video balun's. I like this camera as you have a lot of focus ability with it, and you can also buy a telephoto lens for it.

I found mine at Menards, but bought it online from the vendor (Swann) because they had a combo package that included the camera and two different lenses... http://www.swann.com/s/products/view/?product=328

They used to have an online store but it doesn't appear that they do anymore.

Here is the Menards link: http://www.menards.com/main/see-more/home-accessibility/every-room-essentials/home-security-safety/home-monitoring-systems/mini-analog-wired-camera/p-1398517.htm

Jim