Packt Publishing is offering a great, 50% discount for all our Elasticsearch related books (actually ebooks) till 11th of March 2016. If you are interested, you can buy the book with the discounted price at Packt Publishing website with the ESSERVER50 discount code.
Update: The promotion has been extended and is supposed to last till 30th April 2016.
The books that are on sale include our newest, soon to be released Elasticsearch Server Third Edition. The full list of books covered by the discount: