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 What file formats are recommended for On-demand Printing services? Where can I find Panoramic Postcards and Mailed Flyer media types to use for my mailings? What paper stock is used for the mailings? Will someone review my order after it has been placed?