Outwater Industries Extruded Aluminum 90 Degree Angle Alu149-p Polished 1/4 x 1/2 x 3/64 (.050)-in Thick Aluminum in the Furniture Moulding department at Lowes.com
Cox Hardware and Lumber - Aluminum Angle (Sizes)
Everbilt 1 in. x 36 in. Aluminum Angle with 1/8 in. Thick 801367 - The Home Depot
MetalsDepot® - Buy 6061 Aluminum Angle Online!
Everbilt 3/4 in. x 96 in. Aluminum Angle with 1/8 in. Thick 802647 - The Home Depot
National Brand Alternative 802627 1-1/4 in. x 96 in. Aluminum Angle with 1/8 in. Thick Silver Metallic Pack of 5