How much would my iphone be worth?

I have an iphone 4 with 8 GB there's no screen damage or water damage but my off button has become jammed if i push down really hard on it with a key or something it works but i set up assistive touch or whatever its called that turns the phone off i'm just wondering about an estimate of how much it would cost because i might switch to at&t instead of verizon

Maybe ranging from 230$ - 300$

Approximately $199

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