I haven't had any success myself when I did a hunt for places in January. I can confirm that there are no places in Nanaimo that even sell junket rennet.
I have contacted Natural Pastures and Qualicum cheeseworks to see if they sell any of their cultures. Unfortunately, they do not.
The one place I haven't checked with is the Ecoreality group on Salt spring island to see where they get their supplies from as they make feta but most likely they get it shipped in and don't sell it.
I've had to have all of my stuff shipped. I recently bought a bit from thecheesemaker.com but I'm going to place a good sized order from Glengarry next.