Hello
Hi, are you interested in the chair? It's very sturdy.  I originally paid almost $200, so this is a great deal at $50. Are you ready to buy? 
would you take 40? The previous ad had a similar chair for 35 but your's seems to be better. I think 40 dollars is fair
We have a deal if you can pay $45.  Deal?
40 dollars and I'll come and pick it up.
Okay, deal!