Giro semi glasses spare lenses- anyone know where to get?

bike-a-swan
bike-a-swan Posts: 1,235
edited March 2011 in MTB buying advice
I'm thinking of getting a set of these glasses, but I wanted to see about spare lenses, and I can't seem to find any anywhere. Checked the madison website along with general googling- anyone seen them anywhere?

While I'm here, anyone got them? Care to comment?
Rock Lobster 853, Trek 1200 and a very old, tired and loved Apollo Javelin.