To perform a global eBay search of all items including one not listed as available to your location, go to the Advanced Search page of your eBay site. Enter the general search keywords and other requirements. At Location, select "Items available to", then from the drop-down box select "All Countries/Regions". This will enable you to see items matching your search at all eBay sites.
There is a free service called geo-ship.com. It enables you to search multiple eBay sites at once and display the results on a single page