T5-12V-4W, T5 Wedge Base Replacement Bulb, 12 Volt 4 Watt Low Voltage - Walmart.com
Feit Electric 18-Watt Bright White (3000K) T5 Wedge Base Dimmable 12-Volt Landscape Garden Incandescent Light Bulb (4-Pack) BPLV518/4/HDRP - The Home Depot
eTopLighting [20 Pack] T5 Type Bulb, 12V, 4W Halogen Light Bulb, T5-12V-4W, VPL1145: Incandescent Bulbs: Amazon.com: Tools & Home Improvement