A brand new combustion engine can be bought from JEGS or Summit Racing for less than $4,000 USD.

A used engine can be had for less than $1,000, and it often comes attached to a car if you are not interested in adding it to a different vehicle.

Electric cars are really cool, but I don't think hundreds of millions of Americans will be running out to switch until maybe 11 years from now, which is how long it took the USA to go from "nobody has a smart phone" to "everyone has a smart phone".