True about used DSLR's; they are basically computers with a shutter. The 10D was replaced by the 20D which was since replaced by the 30D so I doubt you'll find a "new old stock" version around. I've never bought a used DSLR but I'd be hesitant to buy it from someone I didn't know without a warranty. KEH.com is a good one to check, but if you know the history of the camera that's a big plus. Any piece of equipment can fail and that will usually happen at the worst time regardless of how well it's been taken care of. This is why backup equipment is so important when you're working professionally.