My first introduction to Vistaprint (a site that allows you to design business cards, post cards, stickers etc.) was from reading Mrs. Petite's Teaching Passion. She had some fantastic ideas on her blog on how to use this site to your advantage, cost-efficiently.
I absolutely loved the Deskerella "The Desk Fairy" idea so made an order for 250 of these business cards. It cost me less than €5. The picture of the cards below are from Mrs. Petite's blog (seeing as I copied her design) - all credit due is to her! Thanks for the inspiration Mrs. Petite! :)