Masonry ladders are simply 8" X 10' galvanized structural wire used in 10" concrete block construction. They also make excellent supports for plant covers. You can shape them as in the picture below and cover them with plastic in cool weather or cheese cloth to keep birds out. You can also use them for climbing plants. They are $3.47 at Lowes or if you are in construction you can probably pick up used or cut ones for free.
Here's a link to Lowe's