Ends 12/31. Home Depot is offering Up to 75% off Overstock Items as part of their Overstock Sale. Shipping adds $5.99 or get free shipping on $45+; free in-store pickup is also available.
Amazon has the 2 Lutron Maestro Motion Sensing Switches (White, MS-OPS2H-2-WH) for $28 with free shipping. List price: $40. Features automatic motion Sensor Switches, works with all bulb types.
Has excellent Amazon Reviews.