Both of the lumberyards in my city are still running on DOS (or DOS emulation) for their systems, along with quotes printed on dot matrix printers (and no online price sheet). They’re so low margin and old school, I don’t think they get tech upgrades more often than once every two human generations except for new capital equipment, which sucks most of their surplus.

I still use a dot matrix in my office lol. I love the sound and they are so cheap to operate.

I supported a lumberyard that was like this too. Also, some "modern" laser machines required ancient versions of Windows and required floppy discs. This was about 20 years ago, though.