Kindle and Nook eBook editions of Saving the Planet & Stuff are on sale this week for $.99. Kobo's not on sale simply because I couldn't work out how to change the price on the website. If that's a problem for anyone, let me know, and we'll try again.
On sale, all week.
And, remember, you can sign up for a chance to win a free copy of the eBook for Kindle, Nook, or Kobo through tomorrow, which is Earth Day.