Some supermarkets have their own reduction cards. Some give you a percentage on what you buy. In other supermarkets you can save up points which can be converted into paychecks. But anyway, those supermarkets that don't give any reduction are sometimes still the cheapest. Clothing Boutiques are usually the most expensive places to buy your clothes.
Prices there are usually lower than in the supermarkets.
Prices become significantly cheaper then so it might be worth to wait. It started back in the 1950s as an initiative of the students for the publication of study books. Acco tries to sell these at fair prices throughout the year. After having been a shareholder for 5 years, you can exchange your share again. At the shop of Acco, all kinds of stationary and scientific reading matter are for sale.