[header] How to make a tomato cage [title] Buy a roll of concrete reinforcing wire. [step] Pick up a roll of standard concrete reinforcing wire. This is type of wire mesh typically used for construction projects, though it also works marvelously for heavy-duty gardening projects. 
Concrete wire handles similarly to chicken wire, but is much sturdier and longer lasting. You can find concrete reinforcing wire at most home improvement stores and garden centers.