theres canon ones as well.
dont see the point in them myself.. they just take up pages & pages on ebay when searching canon ef lens.
If someone bought me one, Id use it front of them & chuck the contents over them.
but if anyone does want one....
you get them even cheaper on ali
http://www.aliexpress.com/wholesale/wholesale-canon-lens-coffee.html?SearchText=canon%2Blens%2Bcoffee&CatId=0&isFreeShip=y&SortType=price_asc&SortType=y