One on each wrist, a total of $120 ish, no pain at all.
In my experience, pain should not be an issue. If you're willing to go through and get something done (piercing, tattoo, dermal implants), then you shouldn't be worrying about how much it hurts.
'Shop' around for a good shop first. I recommend BMEzine for experiences, articles and recommendations for shops in your area.
They ARE addictive, just like piercings. I just had my nipples done last week, and I'm now considering my third tattoo, and I'm only seventeen. Also, a very famous tattooist in coming to Ottawa in May, so I'm considering some transdermal implants. It's insane.
Otherwise, on the day of the tattooing, don't be nervous. Take a bottle of water, some imodium and hubby, of course. The artist should show you the final design, ask for your approval and transfer it into a stencil. My one piece of advice is to speak up. If you don't like something, point it out right away. When they place the stencil on you, make sure you like it. Don't trust the artist to be perfect in his placing, just like a piercer with placing a piercing.