Retail cost on such kits is around $325. The heads are available in clear, yellow, red or blue, and such kits come with four strobe heads, mounting hardware, connectors, power supply and shielded cables - each shielded cable is 10' in length, you can order cusom length cables for a couple bucks extra. Main manufacturer is Public Safety Equipment Co. (Code 3) in St. Louis Missouri (actually in a small burb called Overland). They will NOT sell to the public so you must go through a retail outlet. You may want to call Ed Roehr Co. and buy from him. He is located on Locust St. in downtown St. Louis. Believe he still installs for most local law enforcement in that area......