Energizer Specialty A23 Alkaline 23a Security Batteries (2-Pack) in the Device Replacement Batteries department at Lowes.com
Amazon.com: Voniko Alkaline Battery 23A - Ultra 23A Batteries (6-Pack) - Long Lasting 12 Volt A23 Battery for Doorbells and Power Remote : Health & Household
50 GP A23 GP23AE 21/23 23A 23GA MN21 GP23 23AE 12v Alkaline Zero Mercury Batteries - Walmart.com