I just purchased this book. Apply the February discount code for 20% off the already discounted price of $9.99 and you can have "The Towers of Midnight" for $8.00 plus tax.
The discount code expires at midnight tonight - it's on the front page of the Kobo store and apparently differs by country/region so I won't repeat it here.
I am very much looking forward to reading this and have been waiting for the e-version to drop.