Try JC Whitney (jcwhitney.com). There are also lots of aftermarket sets like those from MAC for sale out of catalogs for around 200-300. Note that JC Whitney also sells replacement baffles for cheap which you may be able to insert into your original pipes if the outsides are intact. Other options include cycle salvage yards, but donĀ“t overpay. Pretty much all original pipes are rusted out or on their way to rusting out.