Yep, I've looked all over Vancouver and the GVRD. Only Princess Auto sells JSBs in .177, and it's pretty rare to see them in stock. I can tell you that in .22 cal, I pretty much ONLY shoot 18.1gr JSB Jumbo Exact Heavy. I have about 15 tins of them right now. As others have mentioned, you won't be able to open a tin of pellets before you buy them, in my experience. That being said, you don't need to see these. They are simply the best pellets in every way. Not every airgun likes them, but they sure do well in almost every one I've seen.
Reliable Gun does stock some RWS pellets, though. They are pretty decent. What kind of gun are you using?