T-Shirts and Diagram Book Purchase our Convention 2023 book, The Origami Collection (print or PDF) and T-shirt(s) on your registration form or at The Origami Source. The Origami Source Buy books and paper from a selection of fine products from Convention's primary vendor, The Origami Source. Consignments You can consign goods to be sold in The Origami Source. Vendor Sales See what our vendors will be selling. To register as a vendor, go to Vendor Registration. Silent Auction Donate special one-of-a-kind items to our Silent Auction, see what's available, and place your own bids.