User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5112532-20131007212816/@comment-4669934-20131007213229

there is currently a sale on the paper edition of the book. amazon, b&n, ect. which is why it is cheaper than normal. the kindle e-book edition almost always keeps its price from pre-order to 3 years later. it's the format that you are paying for.

in a week to a month, the paper edition of the book will go back up to its normal price.

sucks for us with a kindle to see that deal but that is well, life.