If you want creepy folks with stuff which may be stolen, the chance you may vanish and end up in a landfill for your $250.. buy off Craig's List. If you want to worry about getting burgled and or murderers knowing where you live.. Sell on Craig's List. Then the folks who only bring 80% of the money, telling you they will certainly pay you on Tuesday.. Or even 30% of the money and glare at you menacingly,..
Used to be the best and only place to buy or sell was Audiogon. Good still. It is THE place to buy or sell audio equipment. Particularly big dollar items Want a $10,000 used amp? Or those $30,000 used speakers? Audiogon is the place.
All the rest fall in between.
eBay is great for those $10 to $300 items..
Audiomart, here, Audio Asylum... All fine for $10 to $5,000 items..