Gasoline-powered cars are perhaps the most inefficient devices that many of us use daily. The internal combustion engine is inefficient in term of pollution, gas costs and maintenance costs. Electric motors are comparatively simple devices that do not require much maintenance at all. But, as you may know, it's difficult to obtain an commercial electric car today. One option is to buy a used vehicle that somebody else has converted to an electric vehicle.
You can search for use electric vehicles on sites like Craig's List, eBay, or EVFinder. For more advice on buying an used electric car, I would refer you to Shari Prange's recent article "Finding and Buying A Used Electric Vehicle" (PDF FIle) in Home Power Magazine No 119.