A commercial-grade Level 1 charger (US domestic 110V 15 amp), if they even exist anymore, is probably on the order of $1000 or less - if it breaks buy a no-name replacement from Alibaba until it catches fire.
A professionally-installed Level 2 charger without any payment system infrastructure - so one that's basically free-to-use and taps directly off your AC service-panel at 240V 50-90A will cost about $750-2000 including installation by an electrician - most states offer generous tax-deductions for this btw.
A Level 2 charger that's part of some charger network, like Chargepoint... I've no idea. The hardware looks nice (i.e. expensive) but I'm unsure who pays the cost of the hardware and installation (is it the landowner or is there a cost-sharing deal with the network operator?)
Level 3 chargers... we're talking a minimum 5-figure amount for even a single-stall set-up: as you need a huge (literally: easily 3x3x6 foot) DC transformer appliance for each pair of charging stalls (hidden behind a fence around the corner), connections to seriously high-power mains electricity (imagine a 16-stall Supercharger: that's 8 DC transformers doing ~120kW each: that's 2MW!) in addition to the aesthetically designed car-connector party. According to this article from 2013 (so it's already 8 years out-of-date) Tesla pays $100-200k towards a station, I'm unsure what the cost-split is, but I'd be surprised if the total cost overall was under $250k imo - I also wouldn't be surprised (still) if simply land-use-rights was the majority share: https://techcrunch.com/2013/07/26/inside-teslas-supercharger...
How much does a conventional gas station cost? I would expect several hundred thousand, at least.