Saw this this morning- think it was three tier, with a plastic cover,only a tenner.In a box soI couldn't see what the quality was like,but might be worth it just for the shelves!
I will gladly buy one for a tenner, have one but cover has gone (worn out). Will have a look in Morrisons in Enfield, shop there nearly everyday but never seen them. I do love Morrisons (their seeds and their Brambley apple tree which is growing on the allotment is doing fine and producing apples) and it was very cheap.