[WTA] Used Laptop Price Evaluation, Asus K42JV

Hi guys, I am going to get a new desktop soon and I am thinking of trading in my old laptop since I am not going to use anymore, can you guys help to evaluate how much price my laptop is still worth? This laptop is quite old but the performance considerable still quite well as i can still play games like dota 2, cs go etc.

Specs are as below:

Model: ASUS Notebook K42JV Series
Processor: i5 M450 @2.40GHz
RAM: 4GB
HDD: 500GB
VGA: nVIDIA GeForce GT335M 1GB
Usage: almost 3 years

Appreciate all the feedbacks given !