Where to buy genuine Intel NICs?

Hello,

Reading lots of stories about people getting knock-of Intel cards, even from "legit" vendors.

What is a good way to make sure that I get a genuine Intel part and not one of these "counterfeit" cards?

I am looking at an i350T4V2 or i350T2V2, but the prices are all over the place from $50 deals to $400.... So I don't know ho much I should pay or how to tell if it is a real card.

Any help greatly appreciated.

Thanks

JCL123