RuiLing 10-Pack E10 Mini Light Bulbs Screw Base Indicator Light Incandescent Bulb Old-Fashioned Flashlight Lamp for Physical Electrical Experiment 2.5V 0.3A (No Base) - - Amazon.com
E5 Screw Miniature Small Signal Light Bulb 1.5V 2.5V 6.3V 12V 24V 0.1A 5mmx16mm | eBay
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