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Your best bet is to check the Equipment Exchange here. Most shops in the GVRD have milsurp sections, but stock is generally spotty and things like a Longbranch will get snapped up pretty quickly.
I hate to give up my so far decent source but Reliable Gun seems to get a fair amount of Enfields and such on consignment on a regular basis. I just bought a really nice Savage No4 Mk1 there for 450$ a couple weeks ago. Prices depend on what the owner/consignee is asking. Hope this helps.