try the bay of e europe. I've gotten ecodes there pretty cheap
^^Asking $650.00Or try right here. Bryan1988 has thread offering this very thing for sale right here on the front page of these Classifieds. He states they are for 1979 to 1986 C 900s.
They are listed on eBay with a few other items. I found the price there.I take it you have already enquired? $650 is absurd.