So StreetScooter seems to be selling a van with a 40kWh battery for about $50000. Rivian is talking about building vehicles with batteries between 105-180kWh. That alone will raise the price quite a bit. Maybe it's overkill for a delivery van, but it's also very possible that Amazon has a need for longer trips than the DHL.
The StreetScooter has a range of 31 - 50 miles. This may be enough range for an urban delivery route but not near enough for the large number of suburban or rural delivery routes in the US. In comparison Rivian currently claiming a 410 miles range for their pickup truck. I don't expect the vans to get that range but 250 - 300 is probably reasonable to expect.
