OH MY!
Agreed! GB on that! I would LOVE go putting it around the computer lab hahahahaahha!
You can have the shirts outsourced to someone in Singapore if you wanna lower the cost, black white silk screening cost less than 15 SGD here with the right contacts (you need to provide the designs of course!).....but the shipping may kill you.
Or maybe not. Considering sea freight for distribution by someone in US.
EDIT: for real savings, go to China and get it done