I've been researching cups and the Yuuki cup (which is Czech) now has an English version of it's site, AND it's on sale for 13euro!!!! http://www.yuuki.cz/en/presentation/ http://www.yuuki.cz/en/price-list/
That's all I know, except what I got from Purple Obsidian's site
http://menstrualcups.wordpress.com/2008/12/05/yuuki-cup/