I just heard back from the lady I know that can print these... Here's what I got back:
What a fun idea!!
My only suggestion is that you remove the purple background and put on a "dark purple" shirt or do some art work to make this shirt look cool. I can do it too, but their would be a $25 art charge. :( Putting "square" images on a shirt truly makes them look a little "homemade" and I like our shirts to look rather "cool" - LOL The same would apply for the black shirts - using this much ink for the background is very expensive as I explained, before not to mention we have to pre-treat the shirts to activate the inks.
The shirts you purchased for your son were "kids" sizes and I charged you $12 - The adult sizes are $14.99 for sizes S-L - you can order these shirts directly from OUR NEW site - just select Custom T-shirts under men's or women's and then send me the final graphic with your order number. I'm happy to create these shirts. OH!! make sure and select the "LOCAL DELIVERY" ONES, so you don't have to pay for shipping 
First off, I'd just ignore the bit about eliminating the purple clouds in the background as I think the "square/homemade" look is part of it's appeal...
If you guys want to, I can arrange it so that we just get her the image and then everybody just orders directly from her and has them shipped.
Or, if you want, I could arrange for "Local Delivery" to me on all orders that you'd want me to just bring down to SATX for a pre-game PAK.
Lemme know what ya think, guys.