Wholesalers, retailers, lawyers, etc. When a company goes under it usually involves some form of liquidation of assets, ie selling as much of the physical business as possible. Everything from leftover stock/product to the literal shelves that product was sitting on will sometimes get sold to another business/company or get auctioned off by lot. In the end, if you own the merchandise, as long as the product itself wasn’t banned by a regulatory agency, you’re free to sell it like any other merchandise. So to answer your question, whoever you bought it from.

NB: i have no expertise and could be entirely wrong about everything.