There is another one in Paris which is a little closer to you than Estonia:
http://coord.info/GC2NKPE
I'm also keen to find one of these but they are only issued by HQ for GeoTour caches which appears to be a form of sponsorship/ marketing scheme. However, HQ are actively trying to promote them (I discussed this with MissJenn at last years Kent Mega) so they may yet become more common.