There are some recommendations in this thread:
http://www.t-shirtforums.com/referrals-recommendations/t96610.html?highlight=Digitizer
More can be found by searching for digitizer here in the referrals section of the forum
http://www.t-shirtforums.com/referrals-recommendations/t96610.html?highlight=Digitizer
More can be found by searching for digitizer here in the referrals section of the forum