How old is it? I sold a newer old model PS2 (v9 50010) on ebay a few days ago for $135. The only thing I packed in was an older model PS2 remote. There is a bit of a market for them because of HDD compatibility.
Now is the best time to sell on ebay or half.com 'cause once stock gets replenished in stores, prices are gonna go back down. Also, there's likely to be a price drop to $129 by E3.