Why not just strike a deal with PressCafe.com. Send them the logo and them people order what they want when they want it, it gets made one at a time.

Here's one of the stores, it was set up by Jingles (world of tanks youtuber):

http://www.cafepress.com/mightyjingles

That way it can be hats, t-shirts, polos, mugs, stickers, etc.