Intelectron BC8950 motion sensor

I'm looking for a new-in-box Intelectron BC8950 motion sensor (circa 1990). It is a motion sensor that can be wired in to an existing light fixture, which can then be controlled by a normal light switch. They were great for outdoors use, and had great sensitivity and control. We've had several "protecting" our house for the last 15 years, but one is finally starting to act up. Most everything now is wireless, which doesn't work for our situation.