Recently purchased an IKEA malm bed in king size but we aren’t using the headboard. It’s not free standing, but could possibly be used as a table top? Or attaches to the Malm bed if you need a new one. It’s too big for us to store, but I don’t really want to take it to the tip.
https://www.ikea.com/gb/en/p/malm-bed-frame-high-white-stained-oak-veneer-luroey-s99022569/#content