Each trip with kids young we gave them each @ $30-40 in Disney Dollars that was for their souvenirs. They all got pretty smart about window shopping all week and waiting until last days to make their final buys. Often if hotel had a big store they might shop there. I still have a few items they bought decades ago. And Grandparents, Aunts and Uncles would give them Disney Dollars.
I still have some, likely more in my boxes of Disney stuff. But the few I know where they are at are tucked in the frame with some of my Disney stock certificates.