I searched extensively for a replacement motor, and never had any luck (that wasn't obscenely expensive). In the future, perhaps someone who knows a bit more (than me) about electric motors can use the following info to find a suitable replacement. The marks on the can are as follows:
4ZSC-23U 04P
117v 60HZ 11.29W
Impedance Protected
E48524
Matsushita Electric
I had a show coming up, so time was short. I went to Radio Shack and bought a fan. It was a bit pricey at $26.00, but I was desperate. It's marked as a brushless 4" AC cooling fan. Part 273-241C. Fits perfectly (after the old fan mount was removed), and easy to wire in.
Anyways, we're back in business, and I hope someone can use this info in the future.