Best value I've had so far is a garage sale find. You know that drawer full of odds and ends that you invariably scrape through when you need to repair something at the house? I found a packing box full of that kind of stuff at an estate sale one weekend. The family had put everything that didn't have a home, use, or purpose in that box and plopped it in the corner to throw it away. It was chock full of itsy bits, pieces, screws, bolts, fasteners, plugs, plates, cords, caps, and various assorted incomplete "stuff". Joy!
They were going to give it to me free just for carting it off, but I gave them a buck for it just to be nice. No telling how many thousands of dollars it's saved me.
Brad