How much is a water damaged iphone 3gs worth?

I've dropped my phone in water and tried to make it work again (by doing the typical things like putting it in a bag of rice, leaving it for a couple of days etc) but to no avail, it is still not working properly.

Whenever I plug it onto a charger, it just comes up with a white screen, which I also tried to fix by disassembling it and taking out the logic board and leaving it for a few minutes or pressing the wake and home button simultaneously and it's still with the white screen. So i'm guessing its not working.

Instead, i decided to sell it (because my dad told me to do so) and I'm just wondering how much would it be worth. It is a white iphone 3gs 16gb. The screen has no cracks however the back of the phone does have a small crack, running from the bottom to where those little details/writing etc are.

So, how much do you think, guys?

Any other tips on how to fix it would be GREAT.

Sry but its not worth alot even if it was working. So maybe 40$

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