GE Replacement 13-Watt EQ 21-in Color Select Linear Type A LED Tube Light Bulb in the LED Tube Light Bulbs department at Lowes.com
Lightwise LWL7W40-F13T5 21" Direct Replacement Led Tube, 7-Watt, White, 4000K, Retrofit 13W T5 Fluorescent Tube of your Uncder-Cabinet Lights 50% Energy Saving, Replace Directly Set of 3 - - Amazon.com
Satco Products S1906 13W Mini Bi Pin T5 Preheat Lamp Cool White Pack of 10 - Walmart.com
LED 13W 4' T5 IS RS SC 35K | LED Tubes | TCP Lighting
Pack of 2) F13T5/WW 13-Watt T5 Fluorescent Warm White 3000K Light Bulb 20,000-Hour - - Amazon.com
13W 21" Linear T5 Pre-Heat Fluorescent Lamp Daylight
Duracell Ultra 13W T5 21 Inch Cool White 2 Pin Fluorescent Tube Light Bulb - FLO10026 at Batteries Plus