I know there are a lot of instructions for this one already, but I found a way to make a notebook out of floppy disks that is cheaper and easier than the ones I could find.
Two 3.5” floppy disks, paper, scissors, ruler, hole punch, rubber band
Cut the paper into 30-50 sheets of 3.5 inch squares.
If the lock is covering one of the two holes on the end of the disk, open it up. Line the disk up with the paper and mark where the holes should go. Punch holes through the paper.
Line up the paper so the holes are even with both disks. Cut a rubber band and thread it all the way through both holes. Tie the rubber band back together in the back.
If you ever run out of paper, just snip off the rubber band, refill, and re-tie!