You can market virtually all types of product and goods on Facebook as there are many wiling buyers on the forum. They will have to connect offline maybe physically with you to know how to get the product delivered. Like you said, no tax is involved, just the buyer and seller and their negotiation skills.You cannot actually buy and sell items on the Facebook Marketplace. You can just find the products (or list them) and get in touch with the owner to arrange payment or negotiate the price.
No payment processor supported. No shopping cart, no tax calculation, no nothing that you expect to see as a seller.