Hello, I am interested in your iPad. Is it still available?
Yes it is! It is in amazing condition!
Great! I am wondering if the price is negotiable? 
A little, but it is in fantastic shape and comes with a case.
I already have a case, so I don't need or want the case.
Okay, then I would drop the price to $165.
I am really wanting to pay around $125
I can't go that low. I would go down to $150
I am willing to pick it up today and pay cash. I have $135, that is all. Would you be willing to take that?
I suppose that would work if you pick it up soon with cash.