Our eBook prices often fluctuate due to different sales and promotions. 

Unlike physical books, Publishers can often control the minimum price and the duration of an offer. These sales are often short term and they can even vary from day-to-day, due to specific limited-time promotions and retailer agreements.

We recommend, if you see a price you like, to buy it immediately before the specific promotion expires. Note, the price you see now is the current price, and we cannot guarantee it will remain the same in the future.