To just get your ear lobes pierced, just go to basically any chemist. I recommend not using pre-bought earrings, as they need particular ones to load into the piercing gun, and they must be the right guage and not contain nickel, and be surgical-grade steel or gold. Since ear piercing is usually a package deal, they'll probably make you buy their's even if the earrings you've bought fulfill those categories.
For the earrings, piercing job and aftercare spray they give you, it's around $20-25.
Also, it doesn't hurt much at all, it's just the sound of the gun that jolts you a little.
For any other piercing, including ear cartilage, go to an actual piercing store, and make sure they use a needle, not a gun, as the guns are only designed for earlobes. Guns really aren't a very good method for piercing anything, but I've got 4 holes in my ears from them and they still heal fine, so for ear lobes it's okay.