borrowed from PokPok @ amdmb forums (originally from ocers):

Get 2 free samples of thermal stuff (lots to choose from). Not sure how much or little they give you but looks like this would be great for anyone building their own system and needs thermally conductive stuff to attach that HSF. There are also a lot of other things. I didn't go through the entire list one by one but there seem to be parts or pieces or I don't know for sure but the list was long enough to make my head hurt.

link here
Click on "Request Sample" and you'll come to a form where you can choose from a long list of products to sample (limit 2)