The best stuff can usaually come from the strangest places.
I.E. One man's trash...
If you log onto E-Bay and go to Toys and Hobbies, then select Models, click both check boxes and type in "junk yards", you'll be surprised at the amount of stuff you can find!
It is mostly automotive parts/kits, mostly half built, mostly salvageable, mostly looking like stuff that you built when you were 8, but its usable.
There's been two junk yards that I've purchased from them that had 15-20 cars in them(parts/bodies) and out of that I could salvage 8 vehicles from it.
But let me tell you about the left over parts! They all cleaned up pretty well and are now in jars for future use.
Hope that helps!
Carlos