They are different expiration dates depending on what you are ordering. However, the earliest expiration date is January 2006. Most are 2007 and 2008. Just let me know what you are interested in and I can let you know the earliest expiration date. Yes, they are alot cheaper and I like to pass the savings onto others. We have used the Advantage for over a year and a half now for the fuzzies in the shelter. Marguerite TinyPrints On The Heart..... TinyPrints Shih Tzu, TinyPrints Ferretry and Rescue http://www.tinyprintsontheheart.com Ebay Sales to Benefit TinyPrints Ferret Rescue Medical Fund http://search.ebay.com/_W0QQsassZalohaferrets TinyPrints Ferret Rescue PetFinder Web Page www.tinyprintsontheheart.petfinder.org TinyPrints Ferret Rescue Store www.tinyprintsontheheart.com/onlinestore.htm [Posted in FML issue 4832]