Well you should have a look at Leo's Camera Supply at 1055 Granville Street, in the downtown area, on the main drag (as it were). They still have some film and as decent a selection of old, used goodies as you'll find in this town. (I've been going there since the late '60s)
If you can do a week day between about 8 and 5 you should also have a look at Beau Photo
(1520 W. 6th Ave - look carefully you might miss them) - likely going to be the last bastion of film in Vancouver. When you walk in, do not be taken aback, they are a pro. supply shop but cater to all those-in-the-know in Vancouver. Professionals, students, and anybody else who wanders in. The front section is bags, albums, and behind the counter stock, moving farther in you'll find the darkroom and film/paper area and then down the hall, past the shipping folks is the magical back room...used equipment, new digital, and the super rental department (Ken, Mike, and Jason respectively). I have bought much film, paper, and used LF and MF gear there over the years. Some new stuff too.
Kerrisdale Cameras, the main store on W 41st Ave. - no longer in the downtown area, but into the residential Kerrisdale area. At one time they were the other go-to film/used goodies store. Like many, they've shifted to digital along with the amateur market.
There are a couple of others camera stores, Broadway Photo and Lens & Shutter - both on Broadway (nearish the downtown, but south over the bridge(s) off the downtown peninsula. Not sure how much film related materials they have these days
Enjoy your visit - best place in the world when the sun is out. (pretty terrific the rest of the time too, just a bit damper)
Dave
(left Vancouver after 40 years to the peace and quiet of Vancouver Island)