KOR Pack of 4 – 13 Watt Mini Spiral – GU24 Twist and Lock Base. Self-Ballasted CFL, 2pin Fluorescent Bulb, Neutral White 3500K (60 Watt Equivalent) - Amazon.com
Westinghouse 3794900 18 watt Mini Twist 27 CFL Light Bulb, Frost - Pack of 6 - Walmart.com
OhBulbs Compact Fluorescent MLS13GUSWW - Twist and Lock GU24 Base - 27 – lightingnbeyond.com
Westinghouse 37945 13 W E26 4.38 In. L Cfl Bulb Warm White Spiral 2700 K - Walmart.com
Feit Electric 60-Watt Equivalent T3 Spiral Non-Dimmable GU24 Base CFL Compact Fluorescent Light Bulb, Daylight 5000K (2-Pack) BPESL13T/GU24D/2HDRP - The Home Depot