You can probably pick it up at any dive shop or even down there when you go but I got mine from Backscatter themselves.
Thanks. I was just thinking the same thing. The only two filters I'd want is the Dive (20-50 feet) and Deep (50+ feet). However, getting the Flip 3.1 plus the top flip and Deep filter... comes about $5 shy of getting the kit with all 3 filters.
I was thinking of ordering from Backscatter as well if local Calgary dive shops don't have it. Just waiting to hear from them that it'll fit the new Hero3+.