2-count, Rayovac 3V Lithium Coin Cell CR2032 Batteries – $1.63 Amazon Prime

Comes to $0.82 each
CR2032 Batteries, 2 Pack of 2032 Lithium Coin Cell Batteries
For Use in Specialty Devices – Key Fobs, Remote Controls, Medical Devices & More
https://www.amazon.com/gp/product…PDKIKX0DER