How much is an IPhone 4 8gb worth?

I'm selling my IPhone 4 8gb and I want to know how much it is worth now since the IPhone 6 & 6 plus is out. It work's fine, doesn't have any buttons broken, no cracks, and doesn't have Siri.

It isn't worth anything to phone companies since they don't make the iphone 4 anymore, on eBay they go for about 30-40 bucks.

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