Sorry I don't have any scraps, but have two suggestions:
-Some hardware stores sell it by the foot, so might be worth checking elsewhere (esp. with regional chains)
-Reflectix tape is cheap, a few dollars a roll. You could just coat regular bubblewrap in the Reflectix tape, although this may or may not be heavier (1 layer of foil + adhesive, vs. 2 layers of foil). I used the Reflectix tape to line the inside of CCF pot cozys and it works really well.