My son, now 13, has autism. He is developmentally behind, so he’s like a very large 3-year-old. His only interests are beads and pocket-sized trucks – not cars, pickup trucks only.
There are only so many pickup trucks to be found in the toy aisle, and chances are pretty good that he already has at least one of each. Beads come four for a dollar at any discount store, and I already have enough on hand to keep him well-supplied through his 40s.