They are everywhere... And they are growing.

They are the "gotcha" fees – the hidden fees, the ones that you don't know about that come to your attention after you've received the service or product, and they hurt the most.

Who's got their hands in your 401k? People could be dipping into your retirement and you may not know it, until you retire … thousands of dollars lighter. Our Gerri Willis shows us how we're being Nickel & Dimed with hidden 401k fees.

It's hard to do without a credit card or banking account, but the costs of those products – what you pay in fees – may be more than you bargained for.

CNN's Gerri Willis is kicking off our new series "Nickel and Dimed" this morning.