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We've all been through this before. After exiting the dressing room, you approach the cash register with a few items in hand. You're already thinking about ripping off the tags and wearing your new clothes to dinner that evening. (Is that just me?) As you fumble for your credit card, the sales associate says, "You know, if you open up a store card, you can save an extra 15% today." What do you do? This sounds like an enticing offer! And you'll get instant gratification with a discount today. But before you reach for that shiny new retail card, there are a few factors to consider.