Probably my 30ft polytunnel, bought for £60 4-5 years ago. It's only 24ft at the moment because of where it is sited, but I've had a couple of really good years out of it. The poly was already 5 years old then another 4-5 here, grown lots in the first 2-3 years, but only half used last year and not at all at the moment because its full of Brian's machinery as he gave his workshop to the turkeys last year and now has meat chickens in, so my poly is doubling up as his workshop and rotavator/lawnmower shed!