I've moved almost completely to buying books in Kindle format. Cheap, instant delivery and can carry my selection of books everywhere with me.
That and 7 overflowing bookshelves at home between the wife and myself is good enough reason to try and buy ebooks whenever possible.
I couldn't be bothered with e-books, I prefer to actually have the physical sensation of holding a book and reading it. Plus when you own a real book you can loan it or give it to a charity shop or whatever whereas with Kindle it seems to be more of a lease from Amazon, I recall reading the terms and conditions of a kindle ebook sale a couple of years ago and I thought "f**k that" as it seemed like they claimed a quasi-ownership of any ebook they sold you.
I was actually in the local book centre yesterday for something else and ended up browsing the sci-fi/fantasy section. I ended up buying Off Armageddon Reef by David Weber who I've heard some good things about. The book cost €11.70 (UK £8.99) which seems to be the standard amount for large paperbacks. I checked on amazon.co.uk last night and it was £5.03 which equates to €5.72 so I know where I'll be buying books 2, 3 and 4 if I like the first one. As everyone says, even though I like to support the local place, they just can't compete on price.