Children require a lot of stuff—clothing, bedding, toys, strollers, books—that they’ll use for only a couple of years. As your children get older, consider selling the items they've outgrown to Once Upon a Child, a secondhand seller of baby and kid gear. Located in all 50 states, Once Upon a Child will purchase anything for infants, children, and teens. Bring your items to the store to receive a price based on condition and demand. If you don’t want to spend your profit in the store, the company will cut you a check on the spot. Find a store on the Once Upon a Child website.