In my country wrecking yards are now called auto recyclers.
A lot of the parts on the bay are from them.
They even buy up whole cars on ebay to part out.

There are specialist German car recyclers which carry Bimmer, Benz spares.
You wont get much of a deal from those guys
Some of these yards import whole bodies from Europe to breakdown and sell the parts

Sometimes it cheaper to buy our parts from the U.S. even taking into account the shipping.