This is very useful, even if your country has a poor parts service (about 90% of the globe!).
sbblabotw (Heather) and Indianna mentioned this in another topic and I am sure many people know about it, but no-one is shouting about it here on PF, apparently. So I will!
1. Go to
www.playmobil.de2. Scroll to the bottom of the page and click on ERSATZTEILE FINDEN

3. In the dialogue box type in your part number (no spaces, no dashes)

If the part is available, you get a price in Euros (also a picture, sometimes) and a German name.
If its not available, you get the message:
Das von Ihnen gesuchte Ersatzteil ist leider nicht mehr vorrätig, ('The replacement part you are looking for is no longer available').
Why is this so great?
1. You can find out what parts are no longer available, quickly and easily (and investigate alternatives, maybe).
2. You can find out the cost of each part in advance and decide whether you want to pay that price
3. You can check what you are ordering is what you want (at least, when there is a picture or a distinctive German name) -no more receiving the wrong part because you have supplied the wrong part number.
Personally, from now on I will check with Ersatzteile Finden before I buy any parts on ebay.