good place to buy 6xx series processors

im running an abit as8 mb and an intel 640 3.2 Ghz, at stock voltage it can run 3.6Ghz all day, to hit 4.0GHz stable i have to run it at 1.55v's which i guess is ok because i have an xp120 but full load its at like 62 degrees, but its a chip made in china that i bought from newegg, and was hoping for a better overclock with lower voltage, wheres a good place to get a 6xx series chip that isnt from china!? and im looking at getting an intel 650, thanks!

you should try a vcore droop mod, if you're willing, it will help and you won't need to set 1.55, since i'm sure the vcore is drooping almost 0.1v.