Hello, are you interested in my product?
Yes I am. What kind of condition is it in?
It is in great condition, and it is a very comfortable mattress,
I see. What would you be willing to sell it for?
Well it is listed for about $250.
That's a bit steep for me, and it is used after all. Would you take $100?
Do you think you could go up to $175?
That's a little more than I would be willing to spend. How does $140 sound?
 $140, and I will drop it off next week.
Sounds great, thank you very much.