The best option for Lee, considering that he doesn't want to invest if a minimum amount is required, would likely be a savings account. Savings accounts typically have low or no minimum deposit requirements, making them a suitable choice for someone looking to stash their savings without the pressure of meeting a minimum investment threshold.
While money market accounts may also have low minimums, they usually require a higher minimum balance than standard savings accounts. Certificates of deposit (CDs) generally require a minimum deposit, and treasury bills typically involve a minimum investment as well.