Aldi have got these walk-in greenhouses instore from Sunday 27/04/14 priced at £29.99, seems reasonable.
Product Information :-
Start growing plants in a warm, protected place. Ideal for seed propagation and growing flowers and vegetables.
Strong tubular steel frame with a zip-up door and 4 wire shelves
Heavy-duty reinforced cover for long life
Dimensions: 143 x 73 x 195cm