NAPA has 12-24v LED headlights on sale through the end of June 2012. The regular price is $359 and the sale price is $214.99. The light is made by Trucklite and the NAPA part number is LIT 27270C. The pricing is from the Heavy Duty Truck Stop flyer for June 2012.
Here's a link to the light on the NAPA site. The site does not show the promotional pricing.
Here's the detailed specs on the light that I could only find when I used the sites compare feature.
7" Round LED Headlamp , Complex Reflector Optics Is DOT & FMVSS Compliant For Low Beam & High Beam Performance, 7" Round LED Headlamp , Complex Reflector Optics Is DOT & FMVSS Compliant For Low Beam & High Beam Performance, Metalized Reflector Optics Provide A Lighting Experience That Is Smooth & Clean Across The Driving Surface, Provides A Brighter, Crisper & Whiter Light Output, Close To The Color Temperature Of Daylight, Dramatically Improving Light Projection Distance & Overall Visibility, Durability & Dependability Of LED Lighting Provides A Solid-State, Bulb-Free Headlamp Design That's Impervious To Damage From Shock & Vibration, Military Grade, Die-Cast Aluminum Housing & Non-Yellowing, Polycarbonate Lens Offer Optimum Protection Agasint Damage From Impact, Roadside Debris & Other Hazards, Electronics Are Sealed In Epoxy To Resist From Damage Caused By Corrosion Or Moisture, Drop-in Replacement For #6014, 6015, 6016, H6024 & Par 56 Headlamp Designs, Uses Standard H4, 3-Blade Wiring Connector, Impact Resistant Polycarbonate Lens Protected Against Damange Caused By Debris & Other Hazards