Instructables is a great Web site for do it yourselfers. I just ran across instructions for building a small greenhouse for $25. It's a fun, practical project to help you extend the gardening season.
Instead of using PVC, which isn't very eco-friendly, you might consider other plastic pipe options — or even using saplings.
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I know what you mean, $25 is not so much for some! I will do it and I will be back with reviews, or you can check my https://plus.google.com/+SchwabingzahnarztDe
it is not cheap like you said in the title, but I must admit that it is a decent amount! http://www.yachtbooker.de
it is cheaper than an http://www.minkner.com, for sure many will use your advice!
Instructables is indeed great, for information on http://www.thediygreenhouse.com I also found a lot of great information at the embeded link. They really helped me out when I was looking at making a solar heater for my greenhouse.
Instructables is a great site to get ideas from.