An excellent idea would be to go to the greenhouse forum on here and read some of what the others have done. They can be built very frugally from recycled materials so it isnt always neccessary to buy new supplies. I have salavaged glass doors from the dump even and lumber for shelves and alot of containers for starting plants.

Old gardeners die and don't take their greenhouses with them. Survivors are left with an old rundown greenhouse in the back yard they need to get rid of to sell the property. I got mine free for removing it from the property. Sure it needed to be refurbished but that is easier than starting from scratch and a lot cheaper. Al

I bought mine for a 100.00 dollars off Craig's list. We had to take it apart and put it back together and clean it and buy some glass that had gotten broken . But I'm HAPPY with it. The only thing I don't like is I have to keep a fan going inside during the summer cause it gets hot in there.