Recognizing that it is somewhat unusual that a librarian would recommend that you actually purchase a book, but sometimes exceptions simply must be made. In this case I believe that you would end up with something qualitatively better, and you get to make a charitable donation. So, for the Walking Dead fan and/or fans of graphic novels in general, this week the Humble (eBook) Bundle is for you. For the price of your choosing, you could get the "Walking Dead" graphic novels by Robert Kirkman volumes 1 through 5. Plus, you get some other eBooks as well. All of them are DRM free, meaning primarily that you can use them on every device that you own!
If you are not familiar with Humble Bundle, it works like this. You get to choose how much you want to pay (paying more can get you some bonus content). You also get to choose where your money goes, some to the authors, some to charity, some to Humble. Everything is DRM free, which means that there is no restriction on what computer or device you want to read your humble bundle. And, DRM free also means that you own the downloaded files completely, they are NOT licensed like content "purchased" from the big media outlets (for example: Amazon, Apple [excluding music], Barnes & Noble).
Of course, don't forget our own collection of The Walking Dead, or graphic novels too.