[Kevin Sevcik]

We've had good luck finding the actual freeze spray at Radio Shack. I believe there's a Radio Shack just a few blocks from the arena on Washtenaw. You go south on Hewitt, turn right onto Washtenaw and it's in a shopping center on your right, though it's a bit hard to spot. Google tells me the number is (734) 434-1998 if you want to check first.

Also, freeze spray is pretty much just a compressed air can that's plumbed differently so you don't have to turn it upside down.

Also, also, you should be more worried about condensation, though it's really way to dry and cold up here for this Houstonian. The only thing you might remotely damage from that kind of thermal stress are shoddy soldering jobs, and maaaaaybe the magnets or brushes. As long as you're not spraying inside the case of the motor, you should be good.