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How to pay with cash when car shopping?
The very first time I bought a new car I wrote out a personal check for $5000 (this was a looong time ago!).  And got a call from the sales person that he had called the bank and was told that I did not have that much money in my checking account!  I explained that I had just that day transferred money from savings to checking.  The sales person accepted that and there was never a problem after that.