GE 97588 (12-Pack) F13DBX23/835/ECO 13-Watt Quad-Tube Compact Fluorescent Light Bulb, 3500K, 810 Lumens, T4 shape, GX23-2 bi-pin base - Walmart.com
GE 40-Watt 48-in Medium Bi-pin (T12) 4100 K Cool White Fluorescent Light Bulb (12-Pack) in the Fluorescent Light Bulbs department at Lowes.com
Specialty lamps and long-life bulbs from Light Bulb Place including hard to find, extended life commercial and industrial lightbulbs and replacement lamps.
Bulb Sizes - Lucent Technology
Fluorescent tubes: A brief overview of the different lamp types and sizes
Amazon.com: Sylvania 20 Watt T12 Fluorescent Bulb, Gro-Lux Wide Spectrum Phosphor For Plant Growth, Aquarium And Meat Case Applications, 3400K Color Temperature, 89 Cri, - F20T12/Gro/Aq/Ws model number 22013-SYL : Patio, Lawn