Styrofoam cooler, a few inches of water in the bottom with a porous sub floor. Place a fish tank thermostatically controlled water heater in the water and place Tupperware bins with vermiculite on the sub floor. If you want to get fancy you can place a small fan in there for better air flow.
Get it all set up and adjust the water heater until the ambient air temperature is where you want it.
If all you are doing is a couple clutches this will work great and requires a small investment.
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