Thought I'd post this up here as I just finished it.
I picked up a 50L aluminum Imusa tamale steamer at wallyworld for $40. Thermometer is a $6 Farberware thermo from homegoods, plus fittings for $4. I know it's cheap, but it reads the same as my LHBS thermo, and I can always upgrade it. I used the ball valve and fittings from my old igloo cooler HLT (which is being converted to a bottling bucket)
Total cost $50