It usually says that items will only be sent to Germany "Versand nach: Deutschland". I can use my eBay UK membership to sign into any eBay site I've visited so far. There was a Global eBay, but it closed down.
ebay is global, if you have a url of an item on ebay.com and change it to ebay.co.uk then it works fine (the currency etc is based on which one you go to so it's often useful to do it).
Normally when you do a search the site only shows items that will post to the country that the url is for, but I think you may be able to override that with an advanced search. I've seen some international auctions where changing the url makes the postage to your country vary, so it's worth having a play with it.
