Arrggh. Another one that's too expensive but that I'd love for us to be reading:
Michael Pollan's wonderful and thought-provoking
The Omnivore's Dilemma. But the US Kindle price is $13.99, which is a bit much, though it's much more reasonably priced outside of the US. (from $8 USD in the UK, to $11.50 USD in Canada). Still, that US price is just too much.