My company is going to a 2 days at work and 3 days home setup. But they won't pay for anything except the computer -- if I want a monitor or a docking station I'm on the hook for that, they won't provide it. I recently shelled out for a $500 chair, and I know two colleagues who paid $2-300 for docking stations (I think I'd be happy with a cheaper one, personally).

I think they'll pay for a monitor if you're full-time WFH but that requires special permission.