What a great question! My soon to be 30 year old has always had a $50 Disney Gift card (or Disney Dollars back in the day). I have not accounted for inflation, as she is gainfully employed, but she still gets her $50 from Mom. These days it goes mostly to the kiosks at Food & Wine Festival. At a very young age, she learned to spread it over the days of the trip once she ran out on Day 1 or 2 a couple of times. I got an excellent tip on these boards 20+ years ago. Buy several items at the dollar store, especially the light up ones and Disney related, and sneak them along. A surprise out of your purse/daybag is a great distraction.