I am in junkyards 2-3 times a month. I grab anything and everything. Its amazing what people leave in their cars when they wreck them or send them to the junkyard. I've scored aftermarket amps, subwoofers, high end speakers, expensive stereos...... pennies on the dollar. Built an awesome stereo system for my boat using stuff I found in junkyards. Not to mention wrenches, screwdrivers, breaker bars, sockets, any tool you can imagine, I've found. The amount of money I have found under seats and floor mats could finance a small village. I was in a local yard yesterday rummaging through the back of a Toyota 4runner and found a completely unopened head gasket replacement kit just sitting in the back. Had everything in it, brand new, not even out of the shrink wrap. Head gaskets, exhaust manifold gaskets, bolt set, valve seals, exhaust donuts, the whole works. What a waste. Didn't take it as I had no personal use for it, but good grief what a waste of perfect new parts.
Couple years ago I stumbled upon a 240sx sitting between two trees, bushes growing up through the wheels and the opened hood, looked like it had been sitting there for years. Opened up the driver door, greeted with newly upholstered passenger and drivers seats, exact color that I was looking for, in a slightly heavier duty fabric than the factory and perfect without a speck of dirt on them. I was ecstatic, as my seats were dirty and well worn and had wear holes and tears. They practically gave them to me.
Recently my daughters friends late '90's Camry had one of the rear brakes lock up and overheat. Parking brake cable locked up, shoes worn to the metal, drums rusted solid, etc etc. No money to his name, works part time minimum wage while going to school full time finishing his degree. I sourced all the parts at the stores and it was going to run him about $150 for everything. On the way home from work I stopped at one of my favorite local yards, found a Camry same year as his, pulled the rear wheels off... Score! All new rear brake hardware, everything exactly as I needed. Shoes, drums, clips, springs, etc. None of it looked more than a few months old, shiny springs, rust free drums, everything. Grabbed my tools at home and went back to get every piece of it, it was a gold mine of almost brand new parts. Out the door, $20. He was thrilled.
Other than vacuum hoses, wiper blades, fluids, and headlight bulbs, there isn't anything I wont reuse from junkyard cars if I can find it.