GitHub - sparkfun/LilyPad_Coin_Cell_Battery_Holder-Switched: LilyPad Coin Cell Battery Holder with on/off switch, made by and available from SparkFun Electronics.
Single CR2032 Cell Button Battery Holder with On / Off Switch | Railwayscenics
$2.99 - Round 2 x 2032 Coin Cell Battery Holder with ON/OFF switch - 6V - Tinkersphere
CR2032 2-Coin Cell Battery Holder with Power Switch
3 Volt Coin Cell Holder/Switch [EDDC3C8] - $4.99 : Miniature Designs, Full Service Dollhouse Miniature Shop in Georgia