Ive got $80 I can spend on the phone.
The phone is listed at 160, I'm not taking 80 for it. 
it would be productive fro both of us if you tell me what you would be willng to take.
What if I bring the price down to 140?
My final offer is $100
130 and I'll throw in 7 great movies on the SD card.
Im still at $100, yes or no?
130, 7 great movies on the SD card, and I'll even give you a new case for it. What do you think?
I think $100 and we are done.
125 and you come pick it up.