CDs for me. If you buy a big disc binder they really don’t take up that much room. Its about the same size as the 1971 compact OED that sits on the same shelf.
If I really wanted to get rid of them I’d just donate them to the local library system. The ones they don’t want they’d resell as a fundraiser.
If you or one of your friends can self-host, my group used mumble before discord. I still don’t really know why we switched.