All the legitimate sellers on ebay also are govened by the rules and regulations and as such will list this in their auction listing, so I am sure you will run into a road block in trying to purchase the equipment, if the seller in not legitimate, you may find one, but think about it, would you want to buy a piece of equipment from a non-legitamate dealer that could do a lot of harm, not only to the subject, but the person operating the machine? X-ray is a very specialized field requiring many years of study to do it correctly, The idea is intriging, but I don't think it is worth the risk.

Dave Parker
Ground Glass Specialties