Steppers are here
I got some steppers off of eBay. Not the best, but very cheap. This way, if I blow them up, I'm not out too much cash. And since they have the same mountings as nicer servos, it should be a simple matter to trade them out if I find that they are not up to the task.
I also ordered a stepper controller board, and placed a bid on a power supply to run the steppers. I'm gonna need a power supply capable of supplying 24 volts and more than 20 amps.