I would like to know where you guys get a good condition used 6" Altman fresnel with good wiring, good porcelain socket, color frame, barn doors, cast iron clamp, correct connector, and correct bulb? In NYC used equipment is hard to find cheap. The theater equipment providers get near $100+ for one and usually not equipped the way you like it.
I have had lucky on EBAY and have paid $25 to 50$. Most of the time they have a good porcelain sockets, cast iron clamps, wire, and gel frames. Bulbs work 50% of the time. We have been lucky. I even bought some beat up older units from an honest seller for $15 a piece and then re-wired, re-paint, added new socket and clamp, and a BTL bulb, the all-in cost is about $50. A new Altman is $135 bare-bones.
Fortunately, we now have all the fixtures we need for the kind of shows that we do (9 different shows, 80 lamps to play with). We rebuild about 5 - 10 a year.