Amazon.com: uxcell 6PCS Brown Plastic Housing Button Cell Battery Socket Holder Case : Electronics
2 x 2032 Battery holder - 6V output with on/off switch -...
Amazon.com: WMYCONGCONG 10 PCS 2X CR2032 Coin Button Cell Battery Holder Socket with On/Off Switch and Cover, Lead Wire Type : Electronics
Amazon.com: TAODAN 6PCS Spring Clip Plastic Button Cell Coin Battery Holder Case Button Coin Cell Battery Holder with Leads On Off Switch : Electronics
Single CR2032 / 20mm Coin Cell Battery Holder with Switch : ID 4856 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits