Direct mail postcards have proven to be one of the types with the highest returns. Since there are no envelopes, your message is immediately visible when the recipient pulls the card from their mailbox, and postcards are extremely affordable to produce with one of the most budget-friendly postage prices. Catalogs put a huge variety of products in front of customers and give them a tangible item that builds a bond with your brand. Folded self mailers are made from one folded, sealed sheet, no envelope needed, and offer more space than a postcard.