i bought a 6x3x2 of eBay last year for £54, it is one of those that are galvanised I secured it with straps attached to those spiral screw things for dogs. It was end on to the wind with a fence behind, but the winter gales ripped it off one night. I salvaged the cover and stitched all the seams as they had just undone, I used fishing line 40lb and a curved needle sat in my garage sewing away for ages. I turned the frame round so it would be side on to the wind, I dug a trench for the frame to sit in and when the cover is on I pulled it under so it was inside, this way the frame rests on it when it is buried. I know I lose a bit of head height but I want it to stay on now, I secured it again with 25mm wide straps but have used very long anchors which are 15" long ( I've had ratchet straps on these and not pulled them out ). It's very hot inside and very wet and only has a grape vine and some sprouts in, no plants as I'm using it to restore a conservatory before it goes up next year. Then along with my green house and fenced off growing bit ( dog ) I will go full out, did have a netted area for veg as catapillars were a pest but the snow bent the frame, then the dog joined in a chewed all the stakes in half so that meant I had space to turn the poly round. We still grew some veg as we have a fenced off wild area with a bit of space behind a fir tree, so everything was in pots and bags and we had some success and some failures.