Feit Electric 20-Watt 12-Volt T3 JC G4 Bi-Pin Base Dimmable Landscape Garden Halogen Light Bulb, 2800K Bright White (12-Pack) BPLVQ20T3/2/HDRP/6 - The Home Depot
2 Pack H20W Halogen Lamp Bulb 64115, 12 Volt 20 Watt BA9s, VOSLA Made in Germany - - Amazon.com
GE 20-Watt EQ MR16 Dimmable Bright White Reflector Flood Halogen Light Bulb (3-Pack) in the Halogen Light Bulbs department at Lowes.com
20W Halogen Bulbs 20 Watt T3 G4 Base 12 Volt Halogen Light Bulb 20W 12 Volt T3 JC Lamp for Landscape Track Lighting,G4 T3 Bi-Pin Base,Clear,Warm White,Pack of 10 - - Amazon.com
Philips 20-Watt T3 Halogen 12-Volt G4 Capsule Dimmable Light Bulb (2-Pack) 417204 - The Home Depot