How much do I sell an iphone 4 for?

Fair price, 8gb, black, sprint
perfect condition and works fine

You probably won't squeeze more than $150-$200, higher end of the price if it has the original packaging, earphones, charger, maybe even a case. Other than that, scratches (even small), dings in the corners, etc. Look on the lower end of that.

They aren't in high demand anymore, they didn't have Siri, or really any of the hardware they started introducing until the 4S.

Start at $200.

60 to 100 and then people might not buying your trying to sell a 2010 phone in almost 2014

You may have to pay someone to take that off your hands. Sprint is what drops the value greatly. And that it's old and runs like poo after iOS 7

According to Glyde.com, you could pocket $126 for that model if you want to sell it online.