Mugwump's Fish World

I have been looking at a variety of possible lid materials. Until recently my current favorite was the sunlite material that I could find at Home Depot, Lowes, and Jerry's (a local equivalent). This is the polycarbonate sheets that have square spaces going from one side to the other.
(http://i1322.photobucket.com/albums/u576/BillTre/Photobucket%20Desktop%20-%20Bill%20Trevarrows%20MacBook%20Pro/Photobucket/fish%20room%20tour/PCtanklidsmall.jpg)
there are several things I like about this stuff: It is polycarbonate so it does not warp like plexiglas/acrylis sheets. It is lighter (and therefore less expensive than a solid sheet of polycarbonate because it has less material). On the other hand it is still expensive. Since it seems overly strong for its intended use, I wanted to find a thinner version of this that would have less material and therefore be cheaper.

Once I figured out their generic name was multiwall polycarbonate panels I could find lots of similar things on the web. The product usually found on Home Depot etc, is 8 mm thick.
I found 2 greenhouse supplier places that had 6 mm thick multi-wall panels,
http://www.gemplers.com/icatalog/master/full/348 (http://www.gemplers.com/icatalog/master/full/348)
http://www.multiwallsystems.com/e_store.htm (http://www.multiwallsystems.com/e_store.htm)

and one that had an 8 mm panel made out of acrylic (plexigals).
http://www.greenhousemegastore.com/product/deglas-acrylic-panel-8mm-clear/polycarbonate-panels (http://www.greenhousemegastore.com/product/deglas-acrylic-panel-8mm-clear/polycarbonate-panels)

The prices are good but the shipping is slow.