In Seattle? Probably not going to happen, your best bet would be to get one from the NFL shop, Ebay, or ESPN Shop. If they don t have one on the NFL site you can always customize it to his name and number.
Try shopping networks like HSN.com and QVC.com on the internet. I have done a lot of shopping like this , on the home page just type in what your looking . You can even get a 3,4, or 5 flexpay option on alot of HSN stuff.
I am not sure about Renton or Bellevue, but you could give the Sports Den in downtown Seattle a call. http://www.sportsdenseattle.com/
Ebay
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