I was wrong on the parts prices on the erector style. From his thread:
Qty Part# Description Price
2 each 8968K26 1-1/2" X 1-1/2", 6 length $17.32
6 each 4664T65 2-1/4" X 1-1/2", 6 length $66.54
16 each 4664T22 Steel Corner Plate, 6"x 6" $35.52
1 pack 4664T61 Bolts W/nuts & Washers...