My new house came with a Rollins System VI wireless security system that I don't need. I swapped it out for an Ademco system, and now have all of the peices of the old one (it's certainly not compatible with Ademco equipment). It has a panel, keypad, assorted sensors (door/window, smoke, heat, glassbreak) and a wireless keypad. As far as I am aware it was in working condition when I took it out.
These systems were supposedly reasonable in their day, but seeing as these systems aren't made anymore, and Rollins is out of business it could be very useful for someone who wants spare parts to have this system. If you're interested in purchasing it, let me know.