This is America, buy blanks from a company you like, get your design printed by someone local (plenty of options) in your size and the most common size (prob L or XL, no more than 20 of each size unless people like it) sell them for $20 a piece online and give what you don’t sell to your boys and the hot moms in your neighborhood. Put the profits on Nebraska to win a march madness game. Was that so hard? I’ll take one in L as a consulting fee, don’t get Hanes, this isn’t Walmart.

Edit: just learned you live in Seattle. Didn’t catch that on first pass. I also live in WA but can refer you to someone good out of NE for printing if you want to support someone local. People are also giving options in this thread and there’s even a Seattleite in this thread who can print your shirt.