Why not use that pinned thread to post your wares (as Reply posts to the pinned thread)?
ETA - Seems what you want to do is a permitted activity (2nd link below).
And to solve the mystery, an admin comment from 2017:
And to answer your broader (Policy) question, here’s the admin response, a few weeks ago, to Tim’s very similar question in the thread that @TheGforceNY linked to.
