The trick on Craigslist is to list it for some amount, even if you'd be willing to give it away. That weeds out all the opportunistic people who don't really want a <whatever> and are only messaging because they want free shit.

There's also a funny phenomenon where if you list something for way too much it will sell faster and easier than if you priced it low. If you price low people will assume something is wrong with it, price it high and give a sizable price cut during negotiation and they think they got a fantastic deal.