I've got a large group of Federal Signal V1971 Fire Alarm Strobes being offered on eBay for $5.00 plus shipping.
These units have had their wiring leads cut very short on the rear of the mounting plate, and therefore will need to be repaired. Please note that the listing is categorized as "For Parts/Not Working" for this reason.
Check them out below. A soldering iron and some basic skills should get these working (for hobbyist use) in no time!