Yes, twinwall is double panel polycarbonate with an air channel in between. It should be about twice as energy efficient as that one you were considering from Canadian Tire. It is not clear like glass, but that is actually a benefit because it lessens the harshness of the sun when it gets really bright out. The link below will give you a better idea of what this material is like. Good luck. Here is a link that might be useful: Twinwall

If you're looking for one with plastic sheeting, here's the one I have. It's not a perfect thing(the windows don't really line up all that great, I attached stick on velcro around the open spots to make a better seal) and it doesn't just pop right up like GT's does (took about an hour for me and DH to put up) but the size is nice. Sorry for the bad pic- something on lens. I meant to post pics earlier when GT had a thread going, but we've had our hands full here (entire exterior home redo, we didn't do all the work, but it's been a tough couple of months- plus I'm slowly redoing the interior myself as well) and taking pics hasn't been on the forefront. I will go out and take better pics today. Lynn Here is a link that might be useful: ebay greenhouse

My daughter bought a leather sofa and two chairs from Cosco. The stuff looked good and set good. One chair arrived with no decorative nails. It took many phone calls to get it replaced. The replacement chair arrived damaged. Many more phone calls and no satisfactory resoultion. My daughter finally gave up. Beeman

For those of you interested in the materials used, manufacture location, etc. for the Novaform (by Sleep Innovations) memory foam & gel-memory foam mattresses, check out this FAQ link. Boy was I glad to find out that the first mattress my husband and I purchased (2 years ago) as newly-weds, the gel memory foam, is free of PDBF/Formaldehyde and it is made in the USA. The reason we purchased this mattress was because it helps alleviate pressure-points which was crucial for us to have considering that my husband had recently underwent back surgery. In the two years we have had this mattress, he is still pleased with this purchase; and needless to say, so am I. I understand that comfort is a personalized type of thing, and being that I myself prefer a "in-between/medium" support (not too hard, not too soft), this was a great buy. We live at an altitude of about 5K, so in the 2 years we've had this mattress, the gel portion of the mattress is a bit more stiff when not in use during the winter, then eventually softens up with the applied body-heat; and during the passer-by summers, it is continually soft. Just a heads up! ;-) http://www.sleepinnovations.com/support/faqs/#1