Here's a collection of Celtic knotwork designs on business cards that you can personalize to suit yourself. You can add your own name, job title and contact information on the card's product page.
The cards come in packs of 100 and are available on a variety of card stocks. Prices will vary with your paper choice.
Orders for merchandise from 'Ars Celtica' are filled by Zazzle. They're billed and shipped separately from merchandise ordered through the vendors who supply 'Saga Shirts' and my other products.