Slip on for my 2012 GSX1250

Hi Everyone
Just wondering if anyone knows where I might find a secondhand after-market slip-on muffler for my 2012 GSX1250. I'm not too fussed about the brand as long as it's good quality. I've had the bike since new and have covered more than 115,000km on it (mostly two-up with my wife of 40 years) and it's still going as great as ever. It's not as comfortable as my 2019 DL1000 V-Strom but it sure is a hoot to ride!
Downsy