If you are in sales and don’t think you need business cards you are sadly mistaken. 
The business card is your friend and they can be had cheap. The small investment will pay off as people will not remember you without them. I have been the customer that requests a card and the salesman doesn’t have them. 
I view the lack of business cards as a negative and would rather work with a more established salesman. If you plan to be successful in business then get those business cards made up and keep plenty on hand. Kimra Bettasso has business cards and would not be without them.