I like cheap. Spent about $100? IDK I didn't add it up but it wasn't much to reinforce the walls using the Harbor Freight Greenhouse Blog, the Experts at then ATP who have build one before, and the instructions. Well, I was just joking about the instructions part. They sucked. But I got it done. And it is sturdy as all getout. I like that it sits on the deck, something stable in case we get those hurricane force winds. I also insulated the base and secured it doubly using cedar fencing. It's not totally insulated but I can keep it at 65ยบ using one radiating dish heater if I want.
If you read the blog you will get all kinds of good ideas in there for the HFGH and others, I think. If you read the Post you will get even more better ideas from the good folks here. It's a long thread full of fun stuff. We didn't go off track too much. But you will see in my first post, I was considereing the Palram and ended up with HFGH. All I know is that you should get the biggest you can afford that you can fit into your space. There just never is enough room in them for all we want to do!
The thread "Harbor Freight Greenhouse projects" in
Greenhouses forum
