The term 'Straphangers' Buys, Once' is a crossword solution for the word 'Tokens' (6 letters). Tokens were once used as a form of payment for public transportation in many cities. They were typically made of metal or plastic and could be purchased at ticket offices or vending machines. The term 'Straphangers' Buys, Once' refers to the fact that tokens were once a common purchase for people who used public transportation, or 'straphangers'.