>1.Where can i get a tatoo?

Hara'jaal has a tattoo shop. Taisidon has a tattoo shop (but that quest is closed for now). Occasionally tattoo alterers come around, Ivinn being the most recent one to visit prime.

>2.How much does the tatoo normaly cost?

Hara'jaal tattoos cost 1.5 platinum lirum, tattoo alterer costs vary.