For all those who want to sell their product / merch online, I recommend https://cartelion.com
Cartelion is brand new online, is censorship-free opensource FB with implemented marketplace function, developed in Berlin, where you as a seller can set up your product in a chic and uncomplicated way. The more people sign up, participate+tell their friends about it, the more the products posted there will be found by potential buyers, as I said, the platform is bradnew+promo has not really started yet+so far only a few test products from the developers are online, but the concept is in any case brilliant as I think+you can put the link from your discontinued product then also on his other social media accounts online.