Postcards are one of the most popular marketing tools. Whether mailed or left on display, the broad range of size choices caters to many marketing messages. Postcards are available in various sizes to fit your budget, convey your message, and command attention. When mailed, they help your message reach a target audience. Postcards are also one of the most popular marketing items displayed in a retail environment and make great marketing takeaways with product or upcoming event information.