I'm interested in the Samsung you have for sale.  Is it still available?
I've had other interest, but nothing firm so it's still avalaible. Brand new, in the box waiting to make someone happy!
Samsungs are great phones.  I'm interested, but the $650 is a little high for me.  Would you be willing to come down $100?
Well, I am pretty set on the price, but I will come down to 575
I understand.  Great phone!  I will find a way to do $575.  You have a deal!
great! Sounds good.