Sorry, Sold Out puts a "Sold Out" label on any webpage. Then you can tell your child that you would love to buy the product for them, but as they can see with their own eyes, it is "sold out".
Enter the URL for any webpage. Navigate to the desired product. Push the inconspicuous checkmark button in the upper left corner of the app and a sold out label will appear. Show your phone to your son/daughter, and express sincere disappointment that you cant buy the item they want because...its Sold Out.