Unfortunately not. Except for the handful of dealers I know personally (Columbine of Sunspot Designs, Nancy L. of "Nancy Buttons", and so on) I can't usually associate any particular business name with what they sell. Dealer's Room at any con, for me, is usually just "A bunch of people selling clothes and costume stuff, and a bunch of other people selling books and games and gaming paraphernalia." Often as not, I buy something--but I'll be darned if I can ever identify a specific person I bought something from a second time, unless I knew them socially beforehand.