The Kickstarter launched by Dave Taylor and Mel Bose (The Terrain Tutor) is flying by all stretch goals. If you have not jumped in on this one, its time to check it out!!!!
You can get in on this Kickstarter for as little as pledging for the PDF only at $25. The full book is $45 (where I pledged) and you can even get both.
Terrain Essentials Kickstarter
https://www.kickstarter.com/projects/1560579763/terrain-essentials/description
$136,853 pledged of $40,000 goal
2,933 backers
12 days to go