What is the main purpose of the announcement?

Attention all shoppers. We will be closing in thirty minutes time(74)so please finalize your purchases. We’d also like to advise you about some very special closing time prices. All meat in the fresh meat department must be sold tonight, before we close. Make your way to the meat department for some fabulous specials.(75)Here’s just a sample of what’s on offer: T-bone and fillet steak, only ten dollars a kilo; 100% beef mince for only four dollars a kilo; a selection of quality Europeanstyle sausages for only five dollars a kilo.(76)Be quick, customers! You’ll be able to fill up your freezers.