Keegan -- I have an edge sander in my shop, which I use regularly. I don't have a dedicated disc sander, but I do have a lathe. My lathe has a 24" swing, so turning it into a 20" disc sander is child's play. Simply mount a 20.5" mdf disk onto a faceplate and true it up on the lathe. Mine is made from a double layer of 3/4" mdf so that the screws holding the mdf to the faceplate don't telegraph through to the face of the sanding disc. It's not quite as convenient as a dedicated sander, but it takes up a lot less room.
David Walser
Mesa, Arizona