search on line, ebay starting around the 500 mark new
http://cgi.ebay.com/ebaymotors/Parts-Accessories_Motorcycle-Parts-Accessories__Yoshimura-R-55-R55-SS-EXHAUST-07-06-08-GSXR-750-GSXR750_W0QQitemZ290164487416QQddnZPartsQ20Q26Q20AccessoriesQQadnZMotorcycleQ20PartsQ20Q26Q20AccessoriesQQddiZ2811QQadiZ2863QQcmdZViewItem?_trksid=p3756.m20.l1116