Trust me self piercings are really hard to get right and half clean enough to heal.
If your at Knox SC go to New Image, there probably your best bet at Knox.
Eastland, go to off ya tree. They can be more expensive, but they are the fucking bees knees man. The best.
If your buying jewelery along with the lip piercing, at a normal saloon or something your looking at $50 or $40 depending on the jewelery.
Off ya tree is probably like $60 because there jewelery is expensive.
But theres not really anywhere that will do it underage, unless they're relatives or friends.