I have spoken with a local exhaust manufacturer to me who can fabricate a stainless steel full exhaust system for my 907ie and set the bike up for around the £600.00 mark. - it's too much for me at the momment but the exhaust will be bike specific and fully road legal in the UK. I am sure that worldwide and closer to home you can get one built yourself by a decent back street shop as there are plenty of car exhaust companies that can do the fabrication.
I also have managed to get a brand new left hand silencer from a German company delivered and in it's original box for £60.00 last month so they are still out there.
stuff like this does appear aswell
http://cgi.ebay.com/ebaymotors/Ducati-P ... 0299035898