Yes it will hurt more than it would in other areas. Everyone's pain tolerance is different, but in general softer skin feel pain more readily, so stomache, wrist ,etc hurt more than upper arm, back, and so forth. Color tats usually cost a little more, unless it's s single color, but each shop sets their own price.
Same as your last question, each shop sets their own price, and the price varies.
But, keep in mind that you get what you pay for. If a tat is going to be really cheap, what quality will it be? It's a pretty permanent thing, you don't want it to turn out bad.