You cannot find an electric bike in every place, although for instance China has more than one thousand million electric bikes. Quick to say it, but there are a lot of them in this place! That means good news, much less pollution locally and also in the world.
Different stores sell in Internet kits to convert your normal bike in an electric one, and not as expensive as another bike sometimes. With the help of some tools and instructions, it would be easy turn any bike in a vehicle that counts with another help in the difficulties.
Check it out searching for electric bike conversion, you will be seeing numerous options in a bit.