Northlight Set of 4 C7 Incandescent Clear Twinkle Replacement Bulbs - 2" - Amazon.com
Holiday Time 15' Super Bright Incandescent-Style C7 LED Christmas Lights, Cool White, 25 Count - Walmart.com
C7 Red Transparent Incandescent Bulb – Lightsatwholesale
Feit Electric 7-Watt EQ C7 Soft White Medium Base (e-26) Dimmable Incandescent Light Bulb (4-Pack) in the Specialty Light Bulbs department at Lowes.com