So the extra $5 just gets you a broader choice of file formats? I'm interested in buying it, and I'm pretty sure my kindle show be able to handle the format. T

So the extra $5 just gets you a broader choice of file formats? I'm interested in buying it, and I'm pretty sure my kindle show be able to handle the format. That said, I think I'd rather buy from your website than from Amazon (assuming more of the money ends up in your pocket) - but not at a markup of 50%!