have you tried eastbay?
Am I the only one who has trouble finding gear? I go to the NBA Store and I think they're seriously lacking in Knicks stuff, although there is finally a David Lee swingman jersey that I will be picking up soon. I go to Modells, nothing. Same with Sports Authority and Lids. I would think that Knicks gear would be all over the place this time of year.
I shop online because stores seem to "not have" Knicks gear.
I just brought a few shirts from the NBA store, if you go to knicks.com and go to store they have 2 different stores you can click. I shopped from both.
Eastbay and Espnshop.com has great stuff as well. Hope this has helped you out.
Online, nbastore, and the Knicks arena store.