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E-books can be on the whole vastly cheaper than buying books from Amazon, and often if you check Amazon's pages, e-books are on offer anyway.
But people are under the impression that for e-books, you must get a Kindle device. Sure, if you buying a load of them and studying above anything else, a Kindle can be most useful. But it is not entirely necessary. Kindle software is available for most smartphones and the PC, so you can download them as and when you wish onto the platform you want.
Also, they are stored in the cloud so you can download copies onto multiple machines and smartphones so they are on demand whenever you want them - except when the cloud is broken, that is.