You can't buy the shim material from the same place you bought the chips?
As for a load, peltiers should work. You can calculate their resistance knowing the amps they draw at their spec'd voltage, and then you can calculate the amps they will pull at whatever voltage you give them. I have a few old 72W'ers around here that I use for creating loads like that. At 12V you will need to put a HSF on the hot side to prevent damage to the pelt, at 5V or less you can just hold it in your hand and feel either slightly warm or slightly cool depending where you hold it.
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