Here's the place to buy the Claritycaps. And make sure they are the new, blue-colored MR caps. Much more expensive, but well worth it.:
http://www.madisound.com/catalog/advanced_search_result.php?keywords=claritycap+mr&categories_id=&search_in_description=1&inc_subcat=1
http://www.madisound.com/catalog/advanced_search_result.php?keywords=claritycap+mr&categories_id=&search_in_description=1&inc_subcat=1