An extensive insight view of how I transferred my old digital camera (which would probably fetch only $30 on ebay or such) into a infrared camera. The whole idea is just that a lot of people probably have old cameras laying around, collecting dust, so why not make one of your old cameras an infrared one?
http://geektechnique.org/index.php?id=254
The camera use for this experiment was a Sweex USB Webcam this camera was chosen for it's price and availability. As an added bonus, but nothing to do with this project, this camera works fine under Linux with a 2.6 Kernel (I'm using 2.6.8) using the sonixcam driver.
http://www.hoagieshouse.com/IR/