prices of goods in NCDS

i'll never imagine that when i go to supermarket, i will compare all the prices of products before buying them and what's more, i can tell exactly prices in other supermarket. At that time, i feel myself as a housewife.
NCDS(新世纪百货),in Chongqing, sells the most expensive goods, as far as i know. i can give you some data and you can compare them with those in other supermarket.
椰奶(椰树牌,250ML) N的价格: 2.7元 我知道的最便宜价格: 2.17元
奥利奥(3连装) N的价格: 14.5元 the lowest price i know: 11.9yuan
徐福记(散装饼干等)N的价格: 15.9元/kg the lowest price i know: 14.5yuan/kg
德芙巧克力(散装) N的价格:42.8元/kg the lowest price i know: 35.6yuan/kg
and i also can give you more examples, but the room is limited. i'll never imagine that NCDS is the most expensive shop, which at the beginning says it's for the blue-collar class.
Besides the goods in supermarket, i also found the electronic goods have higher prices.