Do they do walk ins or do you have to make an appointment? And how much would a a cartilage piercing be?

Some walk-in depends on what you want. I would call them first

Cartilage used to be $20 plus jewelry when I worked there but I'm not sure now

I walked in for my piercing and it was 75. I think I would call just to be on the safe side.

I'd call before going...just to be on the safe side. I'm not sure what they charge for piercings nowadays...