I used to work at a place that had dot matrix printers for printing on envelopes, there was some complicated reason why this couldn't be upgraded, anyway the computer that ran that was an Acorn, with all its three mouse button goodness, it could only save to floppy disk and the only supplier of old floppy disks is like this one random dude who seems to have bought up the global supply of floppy disks back when they were discontinued. Apparently he makes bank.