Rear View with autodim and homelink?

Anyone know where I might be able to find a used or aftermarket rear view mirror?  My '06 93 Aero didn't come with the auto dimming or homelinke optioned rear view.  Saab is asking $400+ and I'd think it should be available cheaper else where?

http://www.autodimmingmirrors.com/dealerpricing/index.php