We got our 10' by 8' greenhouse from Friday Ads (
http://www.friday-ad.co.uk/) for free, just had to go and collect it! It was missing about 25 panes of glass, but even after buying them and some new bolts and clips it was still significatly cheaper than even one of the plastic walk in type greenhouses!
There's a thread all about our adventures in getting it to the plot (tied to the roof rails of a Fiat Panda with Mr D's belt and string) and the erection of it here
Chance for a free greenhouse!
It may gove you some ideas / hints / tips! Hope its of some help!
