"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
We didn't have a whole lot of money when I was growing up either. I would always ask for magic books or magic tricks for my birthday or for Christmas and the rest of the year I either had to mow lawns or find part time jobs to help supplement the cost of doing magic.