My wife and I learned that our insurance no longer covered our battery supplies for our Minimed pump, I have since found out that the Animas pump uses the same expensive battery, often they are over $3.00 each purchased from the companies or local stores. We started a business on the side to address this for ourselves and others. www.357batteries.com, sells factory fresh, individually packaged 357 silver oxides for $1.39 each, when bought 25 or more at a time. This is not our full time job, and we are dedicated to providing the highest quality batteries at the lowest price possible to cover expenses. If we can be of service to you, please visit us. or if you have questions, you can ask me about them at" [email protected] Good pumping!