Keep in mind that I primarily consume ebooks, but I generally find books cheaper unless we're counting piracy. You can get physical books from used bookstores for remarkably cheap and ebook/new book prices are kept as close as publishers can get away with.

That said, there are clear advantages to books. You can't page through an ebook nearly as well as a physical reference book. That's admittedly somewhat balanced by the existence of search. Physical books can also pay much more attention to the aesthetics of print and layout. Eink readers and epub/mobi/az3 formats are atrocious for this, whereas iPads with PDFs are somewhat better. There's still works that can't be captured in those formats though, like pop-up books, raised/embossed/textured printing (which I've seen used in poetry), or illuminated works. And books don't need power.