Duracell CR123A Batteries

I need to replace the Duracell CR123A battery in my glass break sensor. This is the original battery from when I purchased the system in April 2018. Can anybody tell me where you get your batteries? I see SS has them for $4.99 each. I have 10 devices that take the CR123A battery. Since one of my devices is notifying me that it has a low battery, I am assuming that they other nine will need replacing soon. Does SS CR123A batteries come in a factory sealed package and what is the expiration date you are seeing on these batteries. Amazon has these batteries but it is hit and miss regarding the quality/expiration date. Thanks in advance.