When purchasing a new bike you must consider what the primary purpose of the bike will be. There are several different categories of bikes such as mountain bikes, road bikes, or city bikes etc. There is also a category of electric bikes that are foldable that are suited for traveling and convenient storage. In addition to these categories, there is also the affordability factor.
Electric Mountain Bike 
For all of these categories there are several different price options. Most categories have high quality options in the price range of $2,000 to $5,000. Some road bikes can reach prices of up to $10,000 dollars though. These more expensive bikes can reach higher speeds and have a higher range than cheaper bikes. You must consider what distance you typically need to travel in order to reach your destination because this can greatly affect the price range. It is also important to check local laws for the speed limit of e-bikes and the legality of them in your area. There are affordable options that are still considered good quality and dependable that cost around $1,000. It is always a good idea to read reviews on the bike, such as at electricbikereview.com, and if possible to take the bike for a test ride before purchasing. 
The Gi FlyBike that was mentioned in the technology section is general-purpose e-bike with some really nice features including smart phone integration. With it’s lightweight foldable frame and 40 mile battery range it costs around $4,000.
There are many different places that are now selling e-bikes. Some common places that sell cheaper bikes include Wal-Mart and Sears. If you are looking for a higher end or more specialized bike then you will have to search for bike stores near you. There are also plenty of places to order e-bikes online. Most e-bike brands have a website that you can purchase the bike from directly.