How much is a nonworking 32gb iPhone worth?

My iPhone only works when it is plugged into the charger. It doesn't work when it's plugged into my laptop, and some car chargers don't work for it either. Sometimes it goes in and out of having service too which has never happened in the year and a half I've had the iPhone (I have Verizon.) My question is how much can I sell my iPhone for? OR is there anything I can do to fix it? New battery? I've called Apple and they tell me to restore it but considering my phone won't turn on when plugged into my laptop that's not an option.Am I SOL?

Approximately $ 15, but i recommend visit this page http://www.gadgetsalvation.com