Our greenhouse was about 10x10 and was mostly made from reclaimed lumber, although we did have to buy some wood, so I think the whole thing cost us about $100.
Hunter helping our neighbour Gerard frame up the walls and build the base.
Putting up the first 2 walls
Make sure they are good and level
Got 3 walls up!
All 4 walls up
Now for the roof and the planter boxes
We used larger stone on the bottom to make it sturdy
Filled up the planter boxes with soil from our compost and used gravel for the center part.
Wrap that sucka up with some plastic (not greenhouse grade, but it will do for now) and plant!
We did tomatoes and cucumbers.
Hunter helped water the plants; our prized cucumber!