Electric car prices tend to be higher when new, but much less to operate. The cost to the environment is also less, though it is harder to place a dollar value on that.
The EV costs more new because of the battery packs. At the present time, it costs around $900 per kWh to make a lithium-ion type of EV battery. This cost is projected to come down with mass manufacturing. Over the next 3-5 years or so it might be possible for the cost to decrease to around $350 per kWh. At this point electric vehicles become much more cost competitive with gas powered rigs.
As for two wheel EVs, they face the same cost challenge, though the spread is not quite as great. For example you can get an average new 150cc scooter fro a range of say $1,200 - $2,000 or so. A new Vespa 250 will set you back about $6,000, but that is high end.
Now a road worthy electric scooter will set you back about twice the average gas scooter cost. Scooter specs and costs are listed here.
As far as operating costs go, this is where Electric cars, trucks, scooters, and bikes rule. The next page gives some operating cost details.
Below is a list of new electric vehicle prices. These costs are estimated for the most part, since there is not much sales history on many of the vehicles. Prices are in USD.