I have a 15" Macbook Pro which I want to sell it is from 2007. I'm wondering what the market value is. Any help would be greatly appreciated. (specs below)

Model Name: MacBook Pro 15"
Model Identifier: MacBookPro2,2
Processor Name: Intel Core 2 Duo
Processor Speed: 2.33 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per processor): 4 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP22.00A5.B07
SMC Version: 1.12f5
Sudden Motion Sensor:
State: Enabled