Expercom offers various Apple MagSafe 2 Power Adapters for $49 plus $6.50 for shipping. (Select "Economy" at checkout.). The deals, each ending August 15:

• Apple 45-watt MagSafe 2 Power Adapter for Macbook Air for $49 (pictured, low by $4, most $78+)
• Apple 60-watt MagSafe 2 Power Adapter for 13" MacBook Pro w/ Retina for $49 (low by $4)
• Apple 85-watt MagSafe 2 Power Adapter for MacBook Pro w/ Retina for $49 (low by $8, most $77+)