cheapest source of heatsink/thermal pads?

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What's the cheapest source for non-electrically-conductive thermal pads? I found some on Ebay, but they seem to be more expensive than the ones I found on Digikey, but I might not be searching by the best terms.

Edit: the ones from Digikey I was looking at are PN BER179-ND
 
Any silicone thermal pad sucks. I've just measured some in TO-220 housing. Regardless which I've used (Bergquist, Fischer and some other) they have a thermal resistance of 2K/W and more.

When I changed to the good old micas and using thermal grease I could simply obtain half of the thermal resistance. In other words: When using micas you can use a smaller heatsink.
 
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