Yes there are. Many companies now offer home security systems, where you install the system yourself. GE, Honeywell, DSC, etc. are all manufacturing home security systems that are easy for the end user to install. The security companies you purchase from should offer you free technical support, and installation guides. You can then purchase central station monitoring from these companies. They are UL listed and just as good as ADT, Brinks, etc, but at a fraction of the cost. I've included a link to a reputable company that offers what I'm talking about. Good luck.