***Warning Geek-Girl post ahead****
I absolutely LOVE u-pull wrecking yards! The one we have here periodically does a bucket special on the cars they are going to crush. Everything you can fit in a 5 gallon bucket (yes, it can stick out of the top) is $5. I've only done the $5 bucket thing one time. I filled it full of european fasteners, rubber trim bits, fuses, relays, H4 style headlamp connectors, weather connectors, etc.
Some etiquette... Don't break stuff, bring the right tool or leave it alone. If you get the part off and realize it's the wrong one or not good or you just find a better one, leave the part inside of the same car you removed it from. Alot of people will just toss it into any car that's nearby or drop it on the ground. Not cool. Your junk might be exactly what the next person needs. If you locate the car you need parts from and the parts aren't there, look inside of the car and inside of the trunk (where they may have been tossed).
If you find something you need that is difficult to remove and expensive, go back and ask what the price will be BEFORE you take it off. Bring plastic bags to wrap dirty parts in so that you don't mess up your own car. Something to lay one (e.g. cardboard) works great but a beater rubber floor mat works well, too.
Have fun!
angela