how to buy a really cheap and utility computer?

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i am quite agony that how to buy a really cheap and utility computer,i heard some of my friends said that the computers are very cheap in America .i am really admiring .in China , there are so many brand of computers on the markets ,i find it is a problem to choose a better one , but to be a student ,i want i can buy a cheap one ,does it a extravagant ?