Do what my friend Rocky does. He was in a store and saw a 42" Plasma TV discounted for quick sale. He told the salesman he wanted it and the guy immediately went into 'bait-and-switch' mode, trying to tell him how much more wonderful his life would be if he bought the one that cost twice as much.
Every time the guy finished a sentence Rocky would smile and say "Thanks. I'll take this one."
"Thanks. I'll take this one."
"Thanks. I'll take this one."
Apparently when they get no other response these guys wear out pretty fast.