Mayne Fairfield 48 in. x 11 in. Self-Watering White Polyethylene Window Box 5823W - The Home Depot
Amazon.com : Mayne Fairfield 4ft Window Box - Black - 48in L x 11in W x 11in H - Polyethylene - Built-in Water Reservoir (5823-B) : Plant Window Boxes : Patio, Lawn & Garden