Hi, Christopher! You're a man after my own heart! Every trip to Walt Disney World that I take is better than the one before, too!
The best place to get your group t-shirts is right there in Downtown Disney. The Hanes Design-A-Tee shop allows you to customize shirts for every member of your group. You choose from a wide variety of Disney designs and characters, select holidays or special occasions (graduations, family reunions, etc.), and add your own wording.
If you can't wait until you get to Orlando, you'll find personalizable t-shirts available through the Disney Store at
www.disneystore.com. You'll find all sizes, various colors, and a good number of personalizable designs.
You can also do a Google search on custom t-shirts. Places like Zazzle have shirts that you can customize for your group. There are also handmade Mickey tie-dye t-shirts available through various vendors.
I love seeing big, happy groups in matching tees! I think it makes the group look so much more festive!