When I saw the hankscraft motors on the website, I thought I remember seeing them somewhere. As it turns out, I used to work in a grocery store when I was 'younger', these motors are mounted to displays. You can see in the pictures above, the one on the left I removed already, the one on the right was used to animate a sign. It had a cardboard tube with it that held some D size batteries. I got these at a local salvage store, but go to your local grocery store, thrift mart etc. If you spot a moving sign take a look at the underside. If its a hankscraft, talk to the store mgr about when the display might come down and that you would like it. They only end up in the trash when the sale is over.
$2 each at the salvage store (American Scientific still has some)