MegaMacs offers the Apple 85-watt Magsafe Power Adapter for Apple MacBook Pro, model no. MC556LL/B, for $49.99 with free shipping. That's $10 under our May mention and the lowest total price we could find by $24. It's compatible with 15" and 17" MacBook Pro laptops. Deal ends July 16.
Note that the extended AC cord is not included. Only the AC wall adapter is provided.