http://www.fastpack.net/
their canadian rates are decent, I ordered 15 rolls came out to less than 5$/roll
couldn't find any at xs cargo
another trick I use is to paint ELMERS foam with dollor store acrylic water based paint and then laminate with clear tape, only do this for armin wing or folding fuselage as it warps the board. Does add infinite possibilities for color/pattern. Elmers is heavier but I usually remove the paper on the inside to save weight.
and lastly the dollorama chains have self adhesive hologram colored covering which is super light and very flashy, a pain to not gget wrinkle in but a good option also