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When we owned the nursery we had two 20x100' greenhouses so I am well aware of problems of high winds and heavy snow load. So I immediately dismissed kits in the $100-$200. Then there seemed to be three price brackets remaining... $500-$700 range, $1500-$1800 range, and then $4000+ range
....after reading volumes of reviews I also dismissed the $500 range as not standing up to our winters here and I won't live long enough to justify spending the $4000+ range. Here is a good link to midrange greenhouses for an overview....
https://epicgreenhouses.com/greenhouses/wood-frame.php
So now I am in the process of taking a real close look at the joinery,weight and materials and am at this point drawn to a redwood one made here in this country and it runs about $1800 and seems to be a good compromise and heavy enough to hold up. If one is too lightweight, even if it has cement tie downs, a good strong wind will shred it. So when I make a final decision you can be sure it was not in haste. This is the link to the one that is the front runner at the moment. https://epicgreenhouses.com/sunshine-greenhouses.php/
All the years I did thousands of rose cuttings I always wanted to try doing clematis cuttings so this would be a chance to try something new and interesting that doesn't depend on keen eyesight. Also all the years on the farm when water was scarce, I was limited to drought tolerant plants. Now I have a sprinkler system and would like to try my hand at growing annuals from seed to fill in my beds.