i bought a secondhand one for (70USD)$80Australian, but that was not a slim. i reckon you could get a slim for $80AU if your lucky or $118AU by most standards.
You'll get around 87 dollars by turning in your PS2.
about 25-30 dollars
56 dollars
$45 Australian Dollars
it is a good price 99.00 dollars
around 40 dollars
5 us dollars
about 55 dollars
In the USA the PS2 is $100 and used starting at $20 up to the $50 reconditioned PS2 at Gamestop will slim lines cost about 130 dollars but normal ps2 cost 250
it is worth about 200 dollars
About 3-5 dollars if you're selling them to Gamestop.
$55 dollars plus Tax