I built a jockey box using a cold plate designed for soda fountains.
You can find a two circuit cold plate on Ebay for under $100. Instead of having two taps I just recirculate the beer through the second circuit for additional cooling. With the flat plate in the bottom you can still use the cooler for something else at the same time.
If you are still looking for a refrigerated cooler you might look into some kind of thermoelectric peltier type chiller. I have no experience with using one but it does sound like a "cool" option.