Best place to buy/sell used audio gear?

I’m getting deeper into the rabbit hole and starting to accumulate gear that I am no longer using. I see many people mentioning buying and selling gear on the sub. I’m curious about where these transactions take place. I have bought and sold phones and tablets via Swappa and was wondering if there was a similar site for audio gear.

I am aware of the avexchange sub and would be interesting in hearing anyone’s experience transacting via this sub.

Now i am use to it its the best product of the year MKC.