that all depends on what game you are trading in.
If you trade in a game for another game you normally have to pay them some.
Ask them.
Almost as much as if you did not trade in a PS2
It depends where you trade it in
$25
Amazon trade in is $5
It depends on which PlayStation it is (1, 2, 3 or the portable one) plus the cost of each game.
No your Playstation is not able to be traded
It was about $500 USD.
Game prices always depend on the game, but the Playstation Store prices are not often below retail.
you can trade in as much as you like.
As of Dec 2011, older model 15 trade in ,slim 25 Trade in.