Wait until Canadian Tire puts their greenhouses on sale for 60% off. We bought a 6X8 greenhouse 2 1/2 years ago for about $350. It looks good and is made of solid materials. I think I priced out materials to build my own an it would have been more to build it myself.
My wife found this though:
http://www.reapscotland.org.uk/repor...house%20v1.pdf
Have a bottle drive, and hopefully you have some unemployed children!!