My Corsair water cooler came with a pad of thermal stuff that I wound up having to remove and replace with paste. It was perfect though because it was spread out perfectly evenly and was a thin layer. I did some searching and there are lots of thermal pad suppliers on ebay. They say it's for ICs which seems like it might be okay for a CPU. I have an i7-6850k. Has anyone ever done this? Here are some examples...
http://www.ebay.com/bhp/cpu-thermal-pad
https://www.amazon.com/ARCTIC-Thermal-Pad-0-5-Conductivity/dp/B00UYTT3I2
http://www.ebay.com/bhp/cpu-thermal-pad
https://www.amazon.com/ARCTIC-Thermal-Pad-0-5-Conductivity/dp/B00UYTT3I2