You can use other items as substitutes, such as coins, buttons, or even pieces of paper. Each player can agree on the value of these items and use them as currency during the game. Another option is to use a deck of playing cards as a form of currency, with each card representing a certain value.
Yes, online poker is legal in the United States, albeit only in certain states. As of early 2024, only six states have legalized online poker  Nevada, Delaware, New Jersey, Pennsylvania, West Virginia, and Michigan.