I am interested in your phone.  Is there anything wrong with the phone?
No, there isn't anything at all wrong with it. I am just uprgrading so that's why I am selling it. I am including a brand new cover and charger as well.
OK.  I could offer you $50 for it and I could pick it up today with cash.
Well, that's a bit too low, as a new cover and charger would cost 30 or 40. But, I will take 60.
I could do $55 today- all cash.
Okay, I can do that. Sounds good.