I designed a card for my sister.
But they’re not your ordinary business cards, they’re mini. I didn’t even know that was an option!
And they’re a good one for her — since they’re a different size, they’ll stand out amongst the other cards; they’re inexpensive, and allow her to print in small numbers; and, you can have different images on one side of the card.
I’m not sure about the print quality, but $20 isn’t too much to find out.
Here are the images, but they include the bleeds because I was too lazy to crop and re-save them. There are 15 colour variations for the one side, and one shared information-side.