Cheapest package was $21; I paid $35 for two 5x7s and two 4x6s, which was the cheapest package with a CD included (you can buy a CD separately with any package but it costs almost as much as the packages that include one anyway). They also give you a coupon for a free photo book from Snapfish. I wasn't terribly impressed with the quality, but both kids are looking at the camera and not crying, so it was a success as far as that goes. We always did Santa pictures at the mall when I was a kid and I had never really thought about doing them anywhere else until this thread, but I think next year I'll look for a place where I can take my own. I don't mind paying if I can use my own camera.
I will say I did really like the Santa at the mall where we went and the whole setup, which was very nice (there was a Mrs. Santa too!) and not too cheesy. It wasn't very busy when we went, so DD got to spend a decent amount of time with Santa and we weren't rushed.