I have a wall mount light and I think the motion sensor control box went bad in it. It was made by Heath Co. and the model Is HB-4192. Does anyone know where I can get one?

It may be easier to get whatever is currently avalailable in your area now. (Home Depot, Big Lots, whatever)
http://shop.ebay.com/i.html?_nkw=Heath+motion+&_sacat=0&_trksid=p3286.m270.l1313&_odkw=Heath+HB-4192&_osacat=0