ayhan 
Bestbuy has Cooler Master – High Performance Thermal Compound – Gray on sale for $3.99 .
Features ;
Suitable for CPU, chipsets on Mainboard, VGA card, etc.
Helps ensure efficient operation without overheating.
Eliminates air gap between heat source and heat sink
Enables lossless heat transfer.
Grease-like silicone materials with metal oxides
Ensure high thermal conductivity, low bleed and high-temperature stability.
4.5W/(m·K) thermal conductivity
Offers ideal thermal conductivity.
Easy application
The included Zif socket templates ensure correct applying area with various CPU socket types.
