If you're worried about buying something online, only to find it available cheaper just a few days later, there's an app out there to help you out.
Earny , which is marketed as a personal assistant, tracks your email account for purchases, spots price differences and deposits the difference right into your checking account.
The app works with major retailers such as Amazon, Kohl's, Macy's, Target and Walmart.
Earny keeps 25 percent of the refund. Other than that, the app is free.