Let me tell everyone about a particular customer I had a show once. He picked out 15 items, asked for a total. I spelled out the cost of each object, and he agreed to all. The total was about $500.
He then slid two items back, and said "how much now?"
I gave him another price (good thing I write down the prices), of about $430. He then slid two more items out, and then drew back the first two. I then asked if he was just waiting for me to make an adding mistake, and all he said was its no big deal. I then placed all of the 15 items, and said that he had agreed to the price of each, and the total was $500. He then said something about this is how he deals. I then said, pass. Prices offered are no longer valid. He got very nasty and threatening, so I had security throw him out. (I also owned the show).
Not one of my favorite deals, for sure.
Rick