I know a friend of mine just used to use his iPad and would use some site or another to download books. So it should be possible to do even without a Kindle/Nook/etc.
It likely only matters how/where you want to go to get access to books.
Yeah, most people who read it these days buy The Great Book of Amber from Barnes & Noble (which is basically all 10 books in one). It's pretty much the only Zelazny book they still stock/in print.
...which is a shame, because Zelazny is a great writer. He was a huge influence on the New Wave scene in sci-fi/fantasy, and he wrote a ton of short stories as well as novels.
I didn't mean books for that. I meant more comics/manga off certain sites. I also own a few due to Humble Bundles that involved books/comics that were thrown into some game bundles. ---