dang. can you say. chiller?
FYI. and Im sure you know this already but...
you can make a chiller for pretty darn cheap very easily.
Get a standalone small freezer from walmart for about 100 bucks. (freezer, not fridge.) drill two holes in the door for send and return. Place a bucket or container in the freezer and fill it full of water. Run the tube from the tank, through the door, and wrap as much fexible tubing within the container as you possibly can to give the water as much dwell time as possible through the bucket of, what will eventually be, solid ice. Put a good sized pump on it to push the water through without letting it freeze in the lines, run the outlet back to the tank, and place the freezer powercord on a timer. Youll have to figure out the sequence of on and off to get the water temp right, but its possible. Another good way of regulating it, but a little bit more expensive, is to buy a thermostat. I think foster and smith have one, but its pricey. You can buy them a little cheaper from market wholesellers.
The thermostats usually have two outlets on them, one runs the chiller (freezer) and one runs the heater. It has a probe that detects the water temperature and adjusts both units accordingly.