how can we get interest by shopping online?

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when my buddies tell me it is a good choice for shopping online ,frome the momnet i always spend my sparetime on shopping online ,such buyying some books ,video player,and game card,even some nice food ,but i dont dare to buy the very high price commerences,i am very worry the quality ,maybe i cant get what iwant after i pay for it ,do yo have a shopping online and wereal can get the cheap price and interest ?