Where to buy authentic colt mccoy jersey?

I want to purchase an authentic colt mccoy texas longhorn jersey. I have looked around and have found a nice white twill one that I like. The only problem is that it does not carry the last name on the back of the jersey. Does anyone know where I can buy an authentic jersey with the name on the back and everything. Colt McCoy is my favorite quarterback of all time and I would really like to have a replica of his jersey. Any information would be helpful. Thank you.