Price: As low as $100 to open

Who it's for: Any child who has earned income

What it's about: You can invest as much as your child makes, up to $4,000 a year. Tax-free compounding over time produces a powerful payoff: A $1,500 yearly contribution will be worth nearly a million bucks in 50 years, assuming an 8 percent average annual return.

Why it works: Few teens are likely to be excited about saving their hard-earned babysitting money for retirement. So offer to match what they make in an IRA. Want another way to ramp up their enthusiasm? Slip a little cash into the gift card too.