Cornels World is in western Canada.
http://cornelsworld.com/
allreptiles.com is in Toronto, has good selection of UTH pads and heat tape, and will ship.
http://allreptiles.ca/heating.html
As for covering the top (and sides, and many other uses):
http://www.homedepot.ca/product/refl...ck-2x10/902355
I folded duct tape around the edges to create a sort of flap to create a better seal and keep the humidity in.











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