When a store sells goods or services at a cost lower than usual, it is called a sale. Sales last for a limited time. Then the cost is returned to its usual amount. There are many kinds of sales. For example, a "back-to-school sale" is held near the beginning of the school year. Parents can save money on clothes and school supplies for their children. A "midnight madness" event starts very late at night. An "early bird special" sale starts very early in the morning, usually before the sun rises. This kind of sale is popular the day after Thanksgiving in November. A favorite sale among many people is the "buy one, get one free" sale. You buy one thing and get a second one without cost. Another kind of sale is a "going out of business" sale. This is when a store owner tries to sell all the goods in the store before closing the business permanently