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Wire Light LED Strand - 10 Blue LEDs + Coin Cell Holder : ID 895 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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
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CR1632 Batteries x10 Lithium for LED Dollhouse Miniature Lights 3V Button Coin Cell - Miniature Crush