This week Sentries is on sale! Sentries on sale this week! Use Sentries2016 (case sensitive) for 25% off the entire Sentries series (ebooks and paperbacks). It's valid from Sept. 12 to 18th (finishes at 11:59pm on the 18th) This code is valid for a single use, per person. The entire collection, including the bundle of the first five books. Hop on over and take advantage of this great coupon!