I think it cost about $25.00 for the wire to build our first potato tower. It's one of those crazy things. Could we even grow enough potatoes in the ring to ever pay for the wire? Probably not. But, I enjoy it so much. I want to try to grow everything!! Here is a close up of the tower and a view of the area it's in. Look how many things are growing in the yard now. Oh I'm happy.