What's a good price to sell an iPhone 4 16gb?

I have an iPhone 4 and the sleep button doesn't work but you can still turn it on/off

100-150 the price lowered quite a bit. Go to Ebay start it off at a dollar and the price may go higher than my estimates! You never know. But nothing over 200.

I'd say 200$ if it's in read good condition, with minor scratches, and if you used a screen protector this whole time (or just in good condition) but if it's a little beaten up or whatever, around 170$ maybee?