Unfortunately, Facebook marketplace and Ebay are probably the best place. Auto Trader is another. These are becoming slightly collectable now. Just had a look and there are 28 on Ebay. Don't undersell it. Has it been started in the last 10 years?.... if not, probably looking at about £1000ish...
I've owned this one for over 20 years, taken me all over Europe many many times, great for all the family.. Also got another full dresser Valkyrie in bits being restored, nearly finished, and my work/Winter bike is a Burgman 650...zero street cred but more fun than it should be!