The best way to go is to include shipping. If you don't, you're going to get 10 tire kickers asking you how much to ship to xyz. Put down that you'll offer a discount (price of shipping) for a local sale. GET THE MONEY BEFORE CALLING IN AND STARTING A TRANSFER !!!)
Put a trigger lock on it. Put it in a box or case that fairly sturdy (read: can't be broken open easily). Don't put any markings on the outside of it that indicate there's a gun inside (brown paper wrapper type stuff). Ship via Canada Post, registered/signature required.
It does not have to be in a locked gun box. I've received restricted forearms right from dealers with just the little screw together type trigger locks and nothing more. The whole idea of trigger locks and locked plastic boxes providing security of any kind is a complete farce anyway. The cheapest method is to cable tie the trigger back. Put it in a good sturdy cardboard box with LOTS lot padding so the heathens at Canada Post don't damage anything. Put lots of tape on the box, including all the corners to lessen the chance of it being accidently broken open (see: Can Post heathens again). Name address, and return address only on the outside. Do NOT write : fragile: gun inside, or anything of the sort. If the folks at the post office ask what it is, tell them it's a car part. It's nobody's business that you're shipping a gun through Canada Post, and it's the ONLY legal way to ship restricted stuff in Canada.