You can grab a copy now over at Amazon. Other vendors are coming soon with the same discount. (At last check, they hadn’t processed the sale yet, but it should be within the next 24-48 hours, roughly.)
Also, on June 10, Playing with Fire (book 1 in series) will be discounted on Amazon.com only as a Kindle Daily Deal, so keep your eyes peeled for that.
Happy reading, y’all.