Today I found a supplier in a town about an hour away that sells used/refurbished barrels for what I thought was a pretty reasonable price. They're only open M-F, 8-3:30, though, and neither of our vehicles will hold more than one, so there are some logistics to work out.
This evening the Magician and I are going to price parts and see if it is cheaper to make our own or take the $49 class again. We're also going to try to get them set up in the yard, now that the epoxy has dried. Stay tuned!