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There are several areas you can look at to cut costs.
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You don't have to live on noodles and nothing else, but you do need to be a savvy shopper. Extreme couponing is great if you have some math skills and the time to spend hunting deals. You can save literally thousands of dollars for a little extra work a week. Also try visiting stores right before they close, when food will be being reduced for the close of business.
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Happy (low cost) studying!