Once your tokens are "installed" on your profile, you can track your spending easily. Most users prefer to keep a small balance ready so they don't have to stop in the middle of a live show to reload.
Some users enable auto-refill, which automatically purchases a set amount of tokens when your balance drops below a certain threshold.
Never attempt to buy "discounted" tokens from third-party websites or "token generators." These are common scams designed to steal your login credentials or credit card info.