...by Orson Scott Card. $18-$20 everywhere (Sony, Mobipocket, Fictionwise), but $6.99 for Kindle Edition. I made a mistake buying the Sony. I should have gone with the ugly, overpriced, asymmetrical, out-of-stock Kindle.
It's obvious that Amazon is getting preferential wholesale pricing, volume discounts, whatever. Why Sony entered the e-book market knowing (or worse, without knowing) that they couldn't compete, is beyond me, and I'm a sucker for giving them my money.