Technology products depreciate rapidly in value, particularly when they are more than a few months old. Never expect to get anything near what you paid for them when you go to sell them.
Pawn shops and antique shops have physical overhead to maintain and often have to hold onto merchandise for a while before reselling it. Given that, they will typically pay much less for items than you could get by selling them online. You should never sell anything to a pawn shop if you're not desperate for immediate money.
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