If you are looking for the Knicks jersey, try this site.
http://www.nyknicksstore.com/jeremy-lin ... jeremy-linAnd in case you didn't know, there are 3 types of NBA jerseys: Replica, Swingman, and Authentic.
Replica: cheapest of the 3, and also uses the cheapest material amongst them. Typically the shoulder areas stick out a bit more.
Swingman: probably what most basketball fans buy, since it looks like the legit thing, and is priced more reasonably than authentic ones.
Authentic: the exact type the players wear on the court. A shinier and smoother texture than swingman. Many don't see that big of a difference between swingman and authentic so they'd consider authentic to be overpriced.