One problem is this site limits Classifieds to posters with 200 or over posts? You'd think that if a person had 50 or so and was a paid member they would be allowed to sell. Therefore there are few Classifieds here. I would list my Whites M6 here but not allowed.
You might try listing on your local Craigslist with email replies turned on, do not post your phone number you will increase your telemarketing calls by 120%! I have also listed stuff on FaceBook with some success. Good luck!!
PS I just sold my Whites M6 in Mint condition on FaceBook Marketplace. Got $260 for it and cash of course. Demo and showed the buyer how to use, he was happy to get.