LR44 / AG13 1.5V Button Cell Batteries (10-pack) : ID 4645 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: AmVolt- Pack of 15 LR44 Batteries AG13A76 Battery, Premium Alkaline Ultra Power Non Rechargeable Button Battery, 1.5 Volt Small Batteries for Remotes Games Controllers Toys & Electronic Devices : Health & Household
Lithium 1.5 V Maxell Lr44 Alkaline Button Cell Battery, Operating Temperature: Non
Maxell LR44 Alkaline Button Cell Battery - 10 Pieces for sale online | eBay