As promised, the compressed edition of The Ravening Deep is now here. This edition uses smaller text to get the page count down from 542 to 450 pages, resulting in a cheaper book.
The ISBN of this edition is 1530541166.
NB — as of 19/05/2016, this edition is removed from circulation. There is now only one (improved) paperback edition available, and you can buy it from this site or from Amazon.
You can find all available editions for Kindle and Print on the book's details page, and buy a paperback edition — signed or unsigned — direct from this site if you wish.
Here are the links for the most commonly sought versions: