It'll be free for two days, according to Phoenix Pick's
special KDP Select promo page, and bafflingly, the tie-in deal isn't for any of Kress' other titles (or any other e-books, for that matter), but a discount on some sort of author workshop thing which… doesn't seem like it would attract that many customers.
Anyway, it's a really good and highly recommended read and IIRC, a Hugo winner.