How we got cheap tyres

My wife and I always visit the same car service centre whenever we want to have our vehicle checked or we have some problems with it. The service centre has recently introduced a new system of recognising their regular customers. They gave us a little piece of paper one day, no bigger than a business card, with spaces for seals inside. They explained that every time we visited the centre, a new seal would be added. My wife had to drive to the centre a couple of times after that: just to have the engine checked and the locks exchanged. To our surprise, when we visited the centre again a couple of days ago to purchase some new winter tyres and have them fitted in our car, we were sold some really cheap tyres of good quality. That was a real bargain. I was perfectly aware how much those tyres would normally cost. I had checked the prices online, of course. No shop had offered them so cheap. What"s more, because we had collected eight seals on our customer card, we had the tyres fitted for free. It was really fantastic. Good but cheap tyres, fitting for free. We saved a lot of cash that day so I invited my wife to the cinema. Then we had dinner at a restaurant. We are sure that we"re not going to change the car service centre for the time being.