@Thomas,
I thought we got better as we went along. Maybe that's why the prices kept going up.
Last negotiation:
Me: The price you quoted me on the phone was X.
Buyer: When was that?
Me: Last week.
Buyer: But the prices change.
You: The price went up since last week by (specific number).
Buyer: (Silence. Disappears to back room).
We get best offer.
First negotiation.
Buyer: Makes a low offer.
Me: No
Buyer: Makes a slightly better offer.
Me: We have other places to visit. Maybe we'll be back later.
Buyer: (sees my list) Buncha crooks at that place.
Lowest offer of the day.