It depends what you want for your GBA.
You call them or go there
UNFORTUNATELY you wouldn't get much because the games are cheap to buy and its a gba [ have better consoles now]
Around $3.
gamestop
gamestop or online
It depend if it is gamestop they will give 30 % of regular price
Gamestop in Machesney Park, IL
Go to a gamestop to find out
$1.50
$1.
75.00