Wire Light LED Strand - 10 Red LEDs + Coin Cell Holder : ID 897 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Button Batteries/ Coin Cells and Simple Circuits
Amazon.com: Taysing LED Light Emitting Diode Round with Battery Holder Coin Cell Holder Assorted Color White/Red/Yellow/Green/Blue Kit Box (φ3mm 1000pcs) : Industrial & Scientific
AMX3d Jewel LP LED with Coin Cell Battery Holder - 5 Low Profile Jewel LEDs Compatible with Lilypad Arduino Projects - 5 LED Kit with 1 Battery Holder and Conductive Thread, Color Blue - Walmart.com
boost - Cheap way to power blue LED on coin cell - Electrical Engineering Stack Exchange
2 x CR2032 Coin Cell Battery Box w/ On-Off Switch & Plain Wires : ID 4988 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Wire Light LED Strand - 10 Blue LEDs + Coin Cell Holder : ID 895 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
10 or 20 Warm White Fairy Light LED's on Copper or Silver Wire with Replaceable Batteries
3 Volt Coin Cell Holder with Switch Wire – The Gundam Place Store
Amazon.com: EmazingLights CR2450 Batteries 3 Volt Lithium Coin Cell 3V Button Battery (20 Pack) : Health & Household
Amazon.com: LiCB 10 Pack LR41 AG3 392 384 Battery,Long-Lasting & Leak-Proof,High Capacity 1.5V LR41 Coin & Button Cell Batteries for Digital Thermometer Ornament Hearing Aid Led Watch : Health & Household
Blinking Blue- Powering a 3.7 volt LED from a 2.4 volt coin cell with a $0.02 charge pump | josh.com