pleeeease help if you can..!

in the movie, when they're in the building taking the test, roy has this black t-shirt that says "think". i've been looking all over for this, 'cause i love that shirt. does anyone know how to get it? or does anyone know if there's a way to get in touch with someone who "worked" on the movie that might be able to tell me? i hope you know what i mean by that, english isn't my first language. :P