3.5 Volt Mini Christmas Replacement Bulbs for Incandescent String Lights, Pinched Base, 50 Count - 612 Vermont
Prestige Glass Art 20 Warm White Mini LED Replacement Bulbs - Green Base - (Check and Make Sure What Type/Size/Shape Base You Need for Your String!!) - Amazon.com
EveryMarket
12V Mini Replacement Stringlight Bulbs - Multi-Color
Pack of 5 Multi-Color Mini Christmas Replacement Bulbs - 6 Volts | Christmas Central