Sterl Lighting Pack of 6 MR16 Halogen Light Bulb 20W/120V GU10 Twist N Lock Base 603728929969 | eBay
Feit Electric 20-Watt EQ MR16 Dimmable Bright White Reflector Light Fixture Halogen Light Bulb (2-Pack) in the Halogen Light Bulbs department at Lowes.com