Miniature Screw Base Light Bulbs, 2.5V, Pack of 10 - Arbor Scientific
2.5V 0.15W 60MA E10 Light Bulb 11mm X 24mm (Pack of 5) | eBay
Amazon.com: JL Missouri Parts 20x 2.5 Volt .425 Watt Clear White Glass Incandescent Bulb with a Green Base Mini Christmas Tree Lights Replacement Bulbs Style A Base : Home & Kitchen
Uxcell 1.5V/2.5V/3.8V/6V/6.2V E10 Light Mini Incandescent Bulbs with 6 Pack Lamp Holders 1 Set - Walmart.com