I would recommend trying eBay. If you use the live.com 30% cashback you can get the 35/1.2 from CameraQuest and claim $200 (the maximum per transaction) back, which could make it cheaper than buying a used lens from someone (not sure what the going rate for the lens on the used market is).
I bought a 35/1.4 Nokton Classic from CameraQuest using this method. More details on this can be seen here: http://www.rangefinderforum.com/modules.php?name=News&file=showarticle&threadid=64633