Newegg does not have IC Diamond but the products saint19 recommended are close to as good and probably on the egg. I participated in some testing of the IC Diamond products here on the forums and was very impressed as it was better than several other good compounds I normally use so I recommend it now. frozencpu.com is totally legit though.
This. Frozen CPU is a little expensive IMO, my last components was bought from Siderwindercomputers and performance-pcs, both has very good price and very similar component that Frozen CPU.