J.V.
GOOD LUCK M.! Keep up the awareness!!! I don't have a connection, but you could order them via www.cafepress.com although you may have already bought the shirts. Hope you find a great sources.
May I suggest you seek out www.FoggyRock.com and/or www.cafemom.com (autism groups) where they have a larger autism community who might have a larger response to your request.
SPREAD THE WORD!!
J. K-V
www.AisForAutism.net