Amazon offers its Prime members the Nilight 7" 36-watt Super Bright Vehicle Spot LED Work Light, model no. NI01A-36W, for $12 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it costs an extra $7.30.) That's the lowest total price we could find by $8. It's mountable to most vehicles and water resistant to 3 feet.