We are also in the $100 per child camp. We have a DS (9) and DD (6) and they have been saving their allowance, doing chores and getting Disney gift cards for their b-days and in their Easter baskets, etc. We go for 10 days and on both previous trips that amount has worked out great. We also get them a shirt and when Grandma goes along she usually gets them a stuffed animal as well. They each have their own wallet that I keep for them and they make all the purchses themselves. It is a great learning experience. The only thing we ever vetoed was one of those light up twirly buzz lightyears for $12 outside the HHMR. DS wanted it more because it was there and he was tired and we knew it was a bad idea. He got over it and was happy to have the money for something else later