As a single parent, I found that looking for places that charged by person rather than by room were less expensive - not half, but at least less. One of my favorite single mom "package" vacations was to a club med. I paid the adult rate for me, the kid rate for my child. We spend like 90% of our time together, but she spent a couple of hours a day in the kids club, which was an awesome break for me. Good luck finding something that suits you!