Toss those fixtures out on ebay, facebook market place, craig list and the like , use the wide range option if available not just local. I have a friend that has over the course of some 50 + years has done the flea market thing. No matter what it is someone somewhere is looking for just that item. He just sold a cast iron lamp that was an oil burner converted to electric , Thing weighs in at some 100# . Guy drove 150miles just to get it. Stuff goes in cycles like anything. He was big into the slot machines and a while back that was a very hot market. He had a couple a of gents drive up from Texas with a trailer in tow , they just about bought every thing he had big $$$$$$. Being 80 years of age him and his wife have decided that this is the last year for flea markets. They have done very well over the years in this venue.