Home Depot offers the Progress Lighting Alpha Trak Collection 1-Light White Track Head, model no. 202638648, for $8.82. Choose in-store pickup to dodge the $5.99 shipping fee. (Build via eBay charges the same price with free shipping.) That's the lowest price we could find by $5. It features 360° rotation and 90° tilt, and uses a 50-watt PAR-20 or R-20 bulb (not included).