You’ve just opened your credit card bill and attached to your statement you find a “convenience check” included. It may already be filled out with a dollar amount such as $300, $500, or even $1,000. Your mind fills with ideas of what you could buy with this “instant” money. A new summer wardrobe, a nice dinner and tickets to a concert, a weekend getaway.But before you go off on a shopping spree, you should be aware that your “convenience check” is nothing more than a cash advance on your cre.