GE Garage and Basement 40-Watt 48-in Medium Bi-pin (t12) 4100 K Cool White Fluorescent Light Bulb (2-Pack) in the Fluorescent Light Bulbs department at Lowes.com
Philips 40-Watt 4 ft. ALTO Supreme Linear T12 Fluorescent Tube Light Bulb, Cool White (4100K) (30 per Case) 422709 - The Home Depot
CURRENT, T12, Single Pin (FA8), Linear Fluorescent Bulb - 46T417|F96T12/CW/C/WM - Grainger
CURRENT, T12, Single Pin (FA8), Linear Fluorescent Bulb - 3JK14|F96T12/DX - Grainger