Many tattoo shops have a minimum. (Or at least, mine does. $50 min for tattoos). Remember to look at the artist's portfolio! Gives you a good idea on their skill as a tattoo artist. Poorly done tattoos will need to be touched up over time, because the ink 'falls' out. Some people bleed, some don't. I bled a little. My boyfriend, who got a tattoo right behind his knee the same day I got mine, bled quite a bit. I found that it didn't hurt too terribly much, except for when my artist was getting closer to my knee.
Aftercare is also huge! Absolutely follow the directions your artist gives you on aftercare. Bad aftercare CAN and WILL mess up your tattoo!! (AKA, don't pick scabs. lol. It will itch, but you must resist!)
I only have one tattoo, although I'm in the process of planning another. It's on my right calf, about halfway between my knee and ankle. It's about...3-4in, and cost $100. However, it has many colors, as it's a betta. :D