"I am now a retired airline ticket agent and got all of these when I was still working, mostly obtained from the skycaps who received them as tips, and knew I collected coins and 'weird' stuff. I don't know where I got the Ron Paul bill, but it was after I retired. Although I never entered any 'Where's George' bills of my own I have entered many that I received, and would exchange them with my passengers explaining how the system worked, trying to 'put some miles' on them, selecting passengers who were going cross country or international. "