Keo cleats have been Look’s standard going back more than 10 years now. I’d say it’s harder to find a set of Look Arc pedals now than Keo (though I understand Peloton machines come equipped with Arc pedals)

I just sold a couple pairs of Keos a couple months ago for $20/pr. For a while you could get the Keo Classic new, with cleats, for only $5 or so more than the cleats, so I bought a few extra pairs to equip all my bikes every time I wore out some cleats.