Dangerden Maze2 $ 42 (Dangerden.com)
Magdrive 250 $ 34 (petsmart.com)
Cube Radiator $ 55 (dangerden.com)
10' 3/8" tubing $ 5 (Home Depot)
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$136
Considering you can get a good radiator at a car parts place for under $40, you can do much better than Tom's hardware did for the same amount of money.