GE 30-Watt EQ T9 Warm White 4-pin Circline Fluorescent Light Bulb in the Tube Light Bulbs department at Lowes.com
Plug & Play 9 Inch T9 Circline LED Bulb Ballast Required!
Feit Electric 30-Watt 9 in. T9 G10q Linear Circline Fluorescent Tube Light Bulb, Cool White 4100K (1-Bulb) FC30/CW - The Home Depot
GE T9 Cool White 4-pin Circline Fluorescent Light Bulb in the Tube Light Bulbs department at Lowes.com
30 Watt Replacement Bulb for Lights of America FCL30EX-L 27K by CodYinFI - T9 9 Inch Circline Bulb with G10Q-4 4 Pin Base in a Square - 3000k Circline Fluorescent Bulb - 1 Pack - Walmart.com