Slightly off the ebook line but still about steampunk and deals:
Starting today and for the rest of the month, the BETHESDA SOFTWORKS game DISHONORED is free for XBOX Live Gold members.
The game is set in a decidedly steampunk world with a unique gameplay mechanic wrapped around a "choose your own adventure" RPG narrative about a wrongly-accused fugitive turned "assassin" that can be played non-lethally. Easily worth its original full price.
Even if you don't play, here's the CGI debut trailer for a look at the steampunk world of Dunwall:
https://www.youtube.com/watch?v=x7JP58KLK3A
It is a thoroughly realized quasi-victorian realm.