Greenhouse staging

Got the staging up yesterday, it's now full, and still have so much to plant today

I need to buy some more, which is easy to erect and dismantle. The one I have is many years old,and can't remember where I got it from,but it's just slot-together tubing with metal mesh shelves and was very cheap.
Anyone have any tips? I can't afford too much and don't want anything permanent

Thanks

Aria

 

I have always thought how expensive it is ... I got some Dexion (angle-iron) and some concrete reinforcing mesh (its a bit better than that as its either Aluminium and doesn't rust, or is powder-coated), but I wouldn't want to have to put-it-up and take-it-down too often!