The 40th Anniversary Edition of Dune for Kindle is outrageously priced and according to reviews, very badly formatted.
Dune at Kindle Store
Even the paperback is expensive at $11.56.
You can buy the paperback from the Borders website for $7.99 and I saw a hardcover version on sale at a B&M Waldenbooks for the same price.
I don't have to think long about which store would get the cash.
One thing I'd never heard of until coming here was buying 2nd hand and slicing the spines off to be scanned. Learning about that alone was worth registering.