WFP systems new or used

I’ve been using a DI system with a Charcoal filter attached.
It is normally a month or 3 between uses.
Reached my limit today trying to do a large job and decided to quit mid-stream so I could go change my resin and filter to tackle this next week fresh. City water has a lot of chlorine. I also work with well water.
I would like to purchase a system - XERO Pure - but have trouble justifying the cost.
All I need is the RO/DI system, not all the accessories.
Do you recommend new or can a used system work?
(No idea where to find used)
Kim the OldH2OMan