Is that the kind that's made of lots of 20mm steel tubing with a thin transparent plastic cover ?
I had one of those, slightest puff of wind and the thing was half way down the road. There's very little to anchor them to the ground and its a lot of sail for very little weight.
Eventually weighed mine down with floor boards and bricks, but then the plastic just ripped and the plastic joiners for the steel tubing just broke.
Mine was a gift. Good job. I wouldn't buy another - better to put the money towards a glass greenhouse.