I'm surprised by the statement of a $500 charger. That's what the L2 chargers at home cost and they are significantly smaller and shorter cables. The Chargepoint CT4000 ( https://www.chargepoint.com/businesses/ac-stations/ct4000 ) has an MSRP of about $9000 ( https://smartchargeamerica.com/electric-car-chargers/commerc... ). Granted a commercial fleet charging infrastructure does not need all the electronics related to billing, but they would want more detailed (network enabled) monitoring & control tools. Regardless of the unit cost, it's still not inexpensive to run the electrical. Gotta dig up the parking lot, run something like 30amps per parking spot. 1500 amps for 50 parking spaces is nothing to sneeze at, the copper cost alone would be decent. Then gotta repave it all again and install the chargers themselves.

So you're looking at maybe $2-5k per parking space, plus the charger unit? Depending on the economies of scale, where power is, etc. Of course, it'll pay for itself which is why businesses will do it. But it's not free.

Also, at least today, these vans are driven all day and charging takes overnight. Maybe some don't need a full 8 hour charge (because they don't drive that far), some are used at night, etc. But the needs would be somewhere close to 1 charger per EDV.

I'm curious if Amazon's charger setup will be different than your normal charging setup. Presumably, you want to charge while the vehicle is being loaded so you want the chargers spaced out around the loading bays. (This nice tour video suggests that things may not be as efficient as I thought: https://www.youtube.com/watch?v=r6lO2_2tyfY)

Those $500 chargers are the at home chargers. I suspect that Amazon would want a more expensive charger that handles higher power to get more energy on-board during a short loading period. As someone else mentioned, the distribution infra is also quite a bit of money.

Don't forget the required power feed and distribution.