Where are you based? I searched for Akrapovic baffles on eBay in the UK and bought a pair for my round cans from Pipe Werx for about £19.95 each - they fitted OK but I had to drill them to fit retaining bolts and of course there was no captive nut as would be supplied on a genuine Akrapovic baffle, but they're still there (I applied thread lock to the fasteners to ensure they didn't loosen and fall out) and the bike doesn't deafen me every time I start it since I fitted them. The eBay search will find baffles for round, oval, hexagonal silencers - maybe not quite to genuine standard, but much more affordable.