Caspian, I don't know any of frog vets in Vancouver, I've heard something about Park Gate hospital in north vancouver. I suggest you just find someone who would sell your meds, in Vancouver it shouldn't be that hard there is a small exotic store in north vancouver as well, you can contact them ask them for advice on which vet to go, usually breeders know all vets in their area.

all those meds are available through vets only and I highly doubt you will be able to get it just because you want to without coming in, it is a possibly a bit different system here in Canada, but you can try, just call them and ask if they could sell stuff as a preventative measure. bactrin i haven't seen over the counter, but ORIGINAL polysporin we have in all drug stores for sure.

P.S. why would you treat every 2 weeks? do you mean constantly every 2 weeks people treat their frogs?
you need to complete treatment and actually before getting meds i would suggest to do a fecal exams on both, chances are you don't need any treatment