Today I sent a sample copy of Down & Outbound: A Mass Transit Satire to Half Letter Press. a distributor that appeals to me both as an author and as a book shopper. Check out a screen shot of their catalog of books, zines, periodicals and posters. Will they respond? They should. After all, I sent them a self-addressed, stamped postcard, (below) which I include with every book order.
Don't underestimate the power of the pedestrian.