Well, I know that this fast food restaurant is at the beach, but they are selling sand?  And barbecued sand to boot.  Talk about a low cost item with plenty of supply.  "Hey Jim.  We've got a ton of customers and we're running out of sand."  "No problem.  I'll go out the back door and get some."

Better yet, it is a sand combo.  I wonder what they combine it with?  Rocks?  Are they barbecued as well?