Hi Kim,
what do you want to update at your 964 ? I can´t say what the cheapest dealers in Germany are.
Different parts you should compare at different dealers. Look into
www.ebay.de too. There is an auction where you can sell an buy Porsche parts too.
Now a few links too:
www.fvd.de www.cargraphic.de www.albertweb.de www.m-freisinger.de www.tebernum.de
...for more Links use LINKS at our Website !
Hope I could help you.
Kind Regards
Thomas