Check out the cost of storing pictures on the camera you are considering. The information below is specific to the use of the Kodak DC50 which we purchased 2.5 years ago. I would not make the same choice today, but it is the one I am familiar with. The digital camera provides several major advantages for teachers preparing material for instruction. No extra boards are required for digitizing.
Serial port downloading is easy enough even beginning students can do it.
Pictures may be downloaded for viewing immediately. You can shoot again if your photography is not good enough. The camera is fairly easy to use. One pulls the flash to one side to turn on the camera and expose the lens and auto-focus. The camera has a rest cycle after 60 seconds and wakes up when any buttons are pushed.