If you have more spare time than spare change, and have avoided phase change cooling because of the price, then this guide will eat up some of that time.  MAKE:Blog has linked to an article describing how to build your own phase change cooling system.
“This project has been many months in the making and I finally had enough time to put this thing together. For those people that aren’t HVAC engineers, Phase Cooling involves using a refrigeration compressor to compress a gas till it changes phases to a liquid. This liquefied gas is then pumped into an evaporator which is place on your processor/GPU. While inside the evaporator, the liquefied gas changes phases back to a gas, and while doing this it sucks up heat and gets pulled back into the compressor, completing the cycle. Now that you have been educated in the basic principles of phase cooling, it is time to get into the meat of this article.”

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