Fidelity has a $2,500 minimum for opening a brokerage or traditional/Roth IRA account. College savings plans (529s) can be opened with a minimum of $50. Access to better fee/commission structures and/or service offerings is often contingent on the amount of assets a client has at Fidelity and/or the frequency with which the investor trades. (For related reading, see Picking Your First Broker.)
Figure 1: An overview of Fidelity\'s popular IRA account.