mate, you could try JC Motors on e-bay, I got a Yoshi RS-3 for my 12 landed to the post-box in 4 working days for $480

no change from about $750 to buy at local dealer.......
they are great people to deal with, hell they even answer e-mails. !!
just do a search on e-bay for m/c exhausts, they are on the first page ...