How much do I sell my Nikon Coolpix P500?

I am selling my Nikon P500 but I do not know the market price right now. That's why I can't decide how much I will sell it.

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How to fix my Coolpix L810?

I have this camera, but my sister dropped it and when I try to turn it on, most of the time is says that i have the lens cap is still on, but it isn't. And sometimes the lens comes out and stays out when i turn it of. What do I do?

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