Make and sell custom button pins. A customer picks a design, you press it, they walk away with something they helped create.
What's included: Step-by-step mini-course, child and adult jobs broken out clearly, pricing worksheet, table sign, order form, set-of-six upsell guide, and fair-day checklist.
What you'll spend to start: A starter button-maker kit runs roughly $100–$160 (illustrative — check current prices). Under $0.20 per button after that.
Adult involvement: An adult operates the press and handles payment. The child runs the customer conversation, designs the buttons, and loads the parts.