July 21 Update: The books are here! The AAVSO has 100 copies of the book that we are selling at the same Cambridge Press discounted rate of $80. So please order from the AAVSO store  and help support the organization. We have the books in stock for immediate shipment.
But wait, there's more! If you add an order for one of our limited edition Centennial T-Shirts , we will take $15 off your total order at checkout.
June 22 Update: Chris Stephan has reported that the book is backordered until July 31. The AAVSO has ordered 100 copies which we will sell at the discounted rate. We expect arrival in mid July. Stay tuned for the AAVSO order form.
Cambridge Press just sent us notification of a 20% off sale for purchases of the book Advancing Variable Star Astronomy: The Centennial History of the American Association of Variable Star Observers ordered via their web site. Their official announcement says it is for a "limited time only" but they have told us that the discount for AAVSO members is indefinite in length. It also says the book is "Available from June 2011", 448 pages with 128 b/w illustrations. List price is US$99.00 and the discounted price is US$79.20.
If you are in the USA, click here to order via their web site  and use the discount code AAVSO100 at checkout.
If you are outside of the USA, click here to order via their web site  and use the same discount code AAVSO100 at checkout.
It can still be ordered via Amazon.com here  (without the discount).