Gamestop 1tb. Cheapest, functionally equivalent. Only caveat is 1 yr warranty vs lifetime for the Lexar one.
They have tested it, functionally there is no difference. Even if in practise there was a difference, it's 800Mb/s vs 900Mb/s. The differential in loading times is fractions of a second. Look it up if you dont believe me.
This one is under $200 for 1TB, seemingly