Hey, hows it going
Good, and you?
Good, so you're interested in the typewriter? 
Yes, could you tell me a bit more about it?
It's in great shape, you can test it before I sell it to you, just so you can be sure you're satisfied.
ok, it is a bit on the 'old' side, would be you willing to accept 25$?
I wouldn't say it's old. It's vintage, and in great shape for it's age. I was thinking of more along the price of $45. You can choose the pick up area if that helps
Hmm, that seems a bit steep - I could come up to 33$
$40 is the lowest I'm willing to go. I can definitely assure that it's worth that price
Ok. I think we can agree to that.