Ebay offers 1500W Electric Post Hole Digger with 6" inch Digging Auger Drill Bit Black for $159.95 (orig. $699.95) with free shipping.

Product Description:
This one-man post-hole digger is ideal for installing fence posts,decks, planting trees and shrubs, ice fishing, and more. It islightweight and easy to start. In addition, it is come with 6" earthauger bits for easily drilling through the toughest soil conditions.