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Buying from an aggressive salesperson
My advice is to quit worrying about the salesman's tactics.  They are a distraction.  What do you want?  How much are you willing to pay for it.  If you want the instrument, decide how much you want to pay for it.  Round down to the next even hundred.  Take that much in $100 bills.  Put the money in his hand and say, "This is what I have, take it or leave it".  You must be prepared to walk out of the store without the instrument.