Equipment is probably going down to $10k within a few years. It's estimated to be at $40k now.
Buses are _really_ bad. Like super bad. The average bus load in the US is around 15 people, so even from the raw emissions standpoint, an individual EV is about on par with an electric bus (never mind a diesel bus).
But wait, there's more. The most polluting part of the bus is not even the engine, it's the driver. Humans have a _huge_ CO2 footprint, and you need at least 2 drivers for each bus to cover most of the day (16-18 hours).