Reddit banned and made selling any firearms against their TOC a few years back.
I actually started the subreddit r/firearmdealscanada right after because the loophole was that you were allowed to post deals and sales just not have direct exchanges advertised or done on Reddit.
Canadiangunnutz does make you get verified through some steps before you can access their BST sides but they have the most listings IMO. The pricing is a bit higher on average though.
Unless you get lucky or know someone, I've found that snagging good deals on new is almost the same price or lower than buying used for most popular guns.
Didn’t know that was you. That’s a great Reddit site for deals, well done.