Then it's time to employ some basic tactics, the activation stage. Using even one of these tactics well, you'll succeed better than most. Explain also that you are considering strongly another similar home which seems more fairly priced. I call these deceptively simple tactics, respectively, comparative value and attractive alternatives. Aggression is out.
Courtesy is in.
Show understanding, even commiseration. Never reveal the true importance of the deal to you. Buying a car is essentially the same. And remember, the ice usually cracks after the sun has set. Patience, too, is a winning tactic.