You think that pricing is random, arbitrary, and capricious, you should see Kindle book prices.
I suspect both involve complicated contract issues and many, many deals. New technology, and they're feeling their way around.
It's like what I went through at Stanford trying to shove Lockheed into the 21st century on weight estimates and solid modeling.
Amazon is pretty cool about pricing and customer service. I just got two bucks off my new Harry Potter blu-ray because the price dropped since I ordered it. They also got a lot of points for letting me return some software that was theoretically unreturnable once opened (new Mac OS wouldn't even try to install on my wife's old computer).