I've ordered car magnets in the past from several inexpensive (read cheaply made) online printing companies and the paint has chipped off and faded, and one magnet even blew off in the wind!
These magnets from Build A Sign are not only affordable, but durably made as well. The colors are bright; the letters are clear; the magnet is sturdy and holds on strong; and their website was so easy to use. They have plenty of clip art to use or you can upload your own design and logo.
Stay tuned for a $25 giveaway to shop for your own fantastic marketing materials from www.buildasign.com!