The library was throwing out wheeled heavy-duty wire shelving units.

Three of them, four feet long by four feet high, once the wheels are off. After unhooking the shelves, I have a very sturdy grid on a stable, open, rectangular base. The end panels are also four feet high by 18 inches wide - they come off and can be arranged to suit.

If I keep one for tool storage in the basement that's 14 linear of feet of the best grid material I've seen for tomatoes, cukes, melons, summer squash - they can be arranged as a line or as cages....

Cost $5, because I paid my daughter to help me wheel them home, as they wouldn't fit in the car.