Everyone has his or her own technique for getting the best price, but a couple of general rules decide in advance your spending limit and stick to it; and do it with a smile these people have seen it all and will not be brow-beaten.
There is only one acceptable method of getting the best price. 
mnli hypothesis: There is only one acceptable method of getting the best price.  premise: Everyone has his or her own technique for getting the best price, but a couple of general rules decide in advance your spending limit and stick to it; and do it with a smile these people have seen it all and will not be brow-beaten.