Thunder on the Battlefield, the fabulous anthology that contains Negotiation, the prequel story to The Mark of the Tala, is on sale through Friday, April 11! You can get the digital book for only 99 cents.
Hell of a deal!
Kindle:
http://www.amazon.com/Thunder-Battlefield-James-R-Tuck-ebook/dp/B00EE15GY6
Nook:
http://www.barnesandnoble.com/w/thunder-on-the-battlefield-james-r-tuck/1116359900?ean=2940148400660
Kobo:
http://store.kobobooks.com/en-US/ebook/thunder-on-the-battlefield-sorcery