Most teenage micro businesses need a business card to hand out to potential customers.
One of the best sources for cheap (or even free if you use of of their stock designs and don’t mind their ad on the back of the card) business cards is Vistaprint.com. They are an on-line printer and can put your name and logo on anything. I’ve used them for my business cards, letterhead, banners and more. I’ve been 100% satisfied with Vistaprint.com
I also found a designer that has some gorgeous designs for business cards. She designed a really cool card for babysitters.
She has an entire teen entrepreneur series of business cards.
Go to the Greek Cookie’s website to see her other business card designs.