Aroo?Looks like it might get to follow in the tradition of camera's changing hands via JC (which is awesome, I really like our group of photog's)
but if you ever need to use it:
http://shop.usa.canon.com/shop/en/catalog/recycling
They buy back lenses as well, I might be doing that here soon. (I really want a 100-400L...but I did find a 28-300L locally for $950, so that might be what I go with)