I just bought the set of 10 from Global off of Ebay. Total for all 10 plus shipping was $97.25.
I replaced all 8 of them and so far so good. I bought the set of 10 so that I have 2 extra if the time ever comes to replace a bad one.
Truck runs just as good as the day it was new.
Do like Phil said and save your money.

Good Luck