I'm interested in the Macbook Pro you advertised.
Hello. That is great. My asking price is $3,000. 
Really?  I thought the $3000 was just in the software updates.  I understood the asking price was $550.
Yes, Sorry. My mistake. $550 is the price. 
I'm glad we cleared that up!  From the ad, I am assuming that this Macbook is refurbished. Is that right?
Yes, That is correct. 
Would you be willing to take $500?  I can pay in cash and pick up the computer today.
Yes, I can drop it to $500. That sounds great.