Style Selections 2-Pack 6.75-in Steel Window Box Brackets in the Planter Hardware department at Lowes.com
ACHLA DESIGNS 12 in. W Black Powder Coat Iron Wall Mounted Flower Box Brackets (Pair) SFB-04 - The Home Depot
Amazon.com: VOXOR Window Box Brackets, Adjustable Planter Box Brackets, Heavy Duty Iron Flower Box Brackets for Railings, with Enhanced Bottom Support - Perfect for Balconies, Fences, and Gardens (4 Pack) : Patio,