I buy Kappa stuff through the
Key Source, 'cause I'm one of those people that has a hard time threading a needle. I got a few things from Color Me Greek when I was in college, and I still have a sweatshirt I got from them about five years ago that looks great (but is now too big

).
I'm not sure if Kappa as a fraternity requires that a store be licensed, but I know I won't buy from any place that isn't.