20mm Coin Cell Breakout w/On-Off Switch (CR2032) : ID 1871 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Tegg 10 PCS CR2032 Horizontal Coin Button Battery Holder Cell Battery Container Case SMT for DIY Arduino : Electronics
Amazon.com: AMX3d Lilypad Arduino Coin Cell CR2032 Battery Holders with Switch – Save Batteries, Switch Off LEDs, Pack of 2 : Office Products
Amazon.com: AMX3d Lilypad Arduino Coin Cell CR2032 Battery Holders with Switch – Save Batteries, Switch Off LEDs, Pack of 2 : Office Products
Lilypad Arduino -10 Pack of Coin Cell CR2032 Battery Holders with Switch - Save Batteries, Switch Off LEDs-Ideal for Schools & Large Projects, Pack of 10 - Walmart.com
Amazon.com: AuBreey 5PCS/LOT for Arduino Lilypad Coin Cell Battery Holder CR2032 Battery Mount Module : Electronics
Power Arduino with a 3.7v coin battery - Project Guidance - Arduino Forum
Lilypad Arduino - Coin Cell CR2032 Battery Holder with Switch - Save Batteries, Switch Off LEDs! - Walmart.com
Power Arduino with a 3.7v coin battery - Project Guidance - Arduino Forum
TinyDuino Basic Kit | Coin Cell Version | TinyCircuits.com