Try Ebay- I just bought a pair for $22 shipped. If any of them are like the vent at 2:40 you could try fixing it once you have it out of the dash by carefully popping the vane out, then drilling a 1/16" hole a little ways into the end where the pin broke off and re-pinning it- I used a piece of a 1/16" wire brad to make the new pin.
