i disagree with my peers. signing a written document is one kind ofcontract, and buying things from anyone is another type of contract.IF you came to a store and bought more than a few $ worth of anything, I would ask to call your parents for permission;because you can bring stuff back and demand cash back.
their shouldnt be a problem, they wont call the cops, there is no rule against buying something from the 7-11 for 80 dollars or more
They won t care how much money you spend as long as you spend it.