Try Craiglist or Facebook Marketplace. A lot of people are switching to stuff like LED and are practically giving old fluorescent lights for cheap/free. At least it's like that in my area. You could always try checking the Restore.
Collecting light bulbs since 2012, a madman since birth.
Collector,Hoarder,Pack-rat! Clear mercury Rules!!
Rapid start ,preheat metal halide mercury vapor and high pressure sodium for life.