I resisted getting my own business cards for a long time. My thought was that I did not want another expense and I did not see them as useful. But after spending the twenty-some dollars to have them made up, I was delighted to carry them around and hand them out when appropriate. People accepted them readily and the transaction was very fulfilling.
It may sound weird but you yourself are a business. You are a service to someone, somewhere. And what you do generates economic activity. Your life force does that. Since you are a business, you should act like one. Businesses have business cards. Use a little imagination, spend the few dollars, and get some made up. I know I am glad that I did.
By the way, I used Vistaprint for my cards and was very happy.