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Where to buy digital textbooks

By using a digital textbook you're able to save a few trees, take notes inside, and lighten your backpack.

Jason Cipriani/CNET

We just covered how to save some cash buying used textbooks, but we left out another option you ought to look into: digital textbooks.

Digital textbooks may not always be the least expensive option, but they're always brand-new, super-portable, and often full of extra content to help you study.

It's unsurprisingly easy to find myriad websites and services offering up digital textbooks, each one claiming to be better than the other. So where does one start? Fantastic question.

Apple's iBooks may not offer many college textbooks, but that doesn't mean it's excluded from at least being mentioned. High-school students will find a healthy offering, however. iBooks is available for download across iOS devices running iOS 5.1 and above.

Amazon takes a different approach to digital textbooks. Instead of purchasing, you rent a digital textbook through its Kindle platform. Select the range of days you'd like to have access to the book, receive a price, and rent. And with the Kindle app being available across nearly all platforms, you're sure to already own a compatible device.

Previously touted as having some sort of price-reducing magic potion, Chegg lacks the same persuasion over digital textbooks. You can rent a digital book for various time periods, or purchase a used book and browse the digital version for free while you wait for it to arrive.

Last but not least is eCampus. Offering up both an iOS and Android app, making it possible to read purchased textbooks, annotate, and share content with classmates from your preferred device.

Before going on a shopping spree, ask your professors if they have any suggestions when it comes to acquiring a digital textbook. Some might not want you to use one, while others will undoubtedly appreciate your efforts to go green.

Do you have a site or service you regularly use to acquire digital textbooks?