I've built a couple of drying wheels/set ups using small clock motors. Cannot recall the rpm's, but they didn't cost more than a few bucks each. I got mine at an electric supply co in Needham/Newton Highlands - just off 128. Cannot remember the name, so I'm no help on that.
FWIW, I rewired the motor so that the cord had an on/off switch, built an oak stand, attached a piece of small diameter alum tubing to the motor shaft, got a big foam disc from Michael's... and there you go. Motor's been powerful enough to turn rods too. All in, probbably cost less than $10 - and I seem to recall the motor was around $6.