I've a lovely pair of sunnies at home that I haven't worn for over a year (Specialized Cortina - not sold anymore). However the hinge broke went dropped. Specifically the "male" end on one arm - the plastic bit that wraps around the metal thingamajig.
I can put a photo up if that helps (tomorrow).
I did try and buy a used pair on ebay but they don't come cheap (enough).