We have done all out milestone and family pictures at Target. They have done a phenomenal job each time. I cannot even begin to complain. Only one time have we spent close to 50 dollars and that included a 11x14, at least 2 8x10s and a bunch of 5x7s. They really do have great deals like no sitting fees, holiday packages, low costs per sheet, etc.
My one piece of advice, if this is going to be for a holiday pic, I would try to select the earliest appointment of the day. They tend to get backed up when their online scheduling permits only 10 mins. between sittings. The minute one appointment runs over, the rest of them are done for! Best of luck!