Paint jobs will cost you as much as you're willing to spend. They're no different than tattoos. You get what you pay for.
If you're patient and need to save a lot of money, I suggest contacting a local high school autoshop or a local community college autoshop program. They usually only charge you for the materials. I will warn you though - paint & the related materials are VERY expensive.
Be very skeptical of anybody who does an inexpensive paint job like maaco.com
Good luck!