Once Upon A Child is a used children's clothing and toy store that offers a mixed experience for customers. While some reviewers had positive interactions with the friendly and helpful staff, others found the store to be overpriced, with a limited selection and poor quality merchandise. The process of selling items to the store was also described as frustrating, with customers feeling that they received low offers for their high-quality items. Overall, the reviews suggest that the store may be a convenient option for purchasing gently used children's goods, but customers should manage their expectations and be prepared for a potentially disappointing experience, especially when trying to sell their own items.