E5 Screw Miniature Small Signal Light Bulb 1.5V 2.5V 6.3V 12V 24V 0.1A 5mmx16mm | 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
E-outstanding 10pcs 2.5V Screw Mini Bulbs and 5pcs E10 Mini Bulb Holder Light Socket Base with Cable which can used for physics teaching, and DIY accessories for car lights - - Amazon.com
Uxcell Electrical Circuit Experiment Set with 10Pcs 2.5V Bulbs, 1Pcs Battery Case/Button Switch/Lamp Holder, 2Pcs Wires - Walmart.com
Miniature Screw Base Light Bulbs, 2.5V, Pack of 10 - Arbor Scientific
30pcs Total E10 Lamp Socket Set 2.5V Bulb Holder Screw Base with E10 Bulb Black | eBay
CP00053708 - Bulbs - Round M.E.S. 2.5V 0.2A - Pack of 25 | Findel International