Price for Late 2008 Unibody Macbook?

[travod]

2.4 Ghz, 250 GB storage, 4 GB RAM (Stock was 2 GB), battery included (though it's the original battery and sucks), with charger and Snow Leopard OS disc. The laptop is physically in pretty great condition (except the inside hinge has cracks). Apple's recycling thing on the store says I can get a $313 Apple gift card for it, but it doesn't take into account that it has upgraded RAM.

 

[travod]

I've been getting multiple offers of $450, so I'm wondering if I could push it up to $500 xD