Except with cloning the other twin would be a different age as with current tech the clone is back to being a baby. You’d need rapid growth tech and mind transfer tech to at least make the clone have the same age, memories and personality, although that would most likely introduce other differences.
It’s a USA thing. Other places often have rules that say the price advertised (on menu, website, in store) is the price the customer pays, all fees and taxes included.