Credit Card Offers From Retailers Are No Bargain

We all know the drill: you're at the store, ready to pay for your purchases when the associate at the register makes a tempting offer: would you like to open a store credit card right now, and get a discount on what you're about to buy? Depending on your payment habits, your decision in that moment could wind up costing you hundreds of dollars in interest payments, judging from data in a new CreditCards.com survey.