Although you may want an electric bike, you may not be able to afford one. You may however, be able to afford the Ego-Kits E-Powered Downhill Bike Kit. A mountable motor specifically made for bicycles, it attaches easily to the frame so that you can power through tough spots even if your legs are kaput.
The Ego-Kits E-Powered Downhill Bike Kit is comprised of a battery pack, crankset, chain, throttle and charger. If you watch the video featured, you'll see just what this baby is capable of.