I work in construction and many of my customers who do freeway/highway work have them installed on their work trucks for safety. They mentioned that they take there trucks to a traffic control company locally. This is the type of company that rents and sells all type of traffic safety devices such as traffic cones, signs, reflectors, lighting/strobes, arrow and message boards and all types of gear for any kind of highway work being done. Any large city in your state should have said type of shop.