What products can be ordered through On-Demand Printing? QuantumPostcards Support September 01, 2017 01:06 Updated Postcards, flyers, booklets, brochures, business cards, door hangers, and more. Related articles Designing & Uploading a Digital Print File Can I request a special fold and/or cut? What file formats are recommended for On-demand Printing services? What is the delivery time for Direct Mail orders? How do I know when I have a lead?