But online sources can ease the hassle and expense of those projects. One site can be very helpful in finding textbook bargains on the Web.

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AllBookstores.com doesn't sell books, but lets users compare the "true" prices. It scours about two dozen online stores and gives the varying prices, factoring in shipping price, tax and availability.

For example, if you wanted the ninth edition of "A History of the Modern World" by R.R. Palmer, Joel Colton, and Lloyd Kramer, you'll find more than a $20 difference between the cheapest and most expensive offer.

One thing to keep an eye on though, especially if your classes start soon, is shipping time and availability.