If you need glass try looking on your local freecycle or freeshare web site. These are listed in Yahoo groups and people give away stuff for free. I regulary see greenhouse glass on the Glasgow Freeshare site, and garden tools.
Glasgow Freeshare:
http://groups.yahoo.com/group/glasgow-freeshare/List of Freecycle sites:
http://groups.yahoo.com/search?query=freecycleI've just collected a greenhouse I bought on ebay. I managed to break about a quarter of the glass in transit. Going round a roundabout - big crash as glass shifted in back! >:(. Luckily I have a large pile of glass from a previous greenhouse :D
