I don't see furniture for No. 5s come up often. I checked both eBay and Gunbroker and found nothing. I'll keep looking, though. I'm not sure if they ship to Canada but Southern Ohio Gun has jungle carbine parts guns that they sell. They go for about $160 I think, but that might be a way if you qualify to buy from them and they can ship to you.
I bought a No.5 last fall - pics are somewhere around here - and love to shoot it!