^ exactly what lord_ashe said. don't trouble yourself with amazon, most the game stores there will have DS Lites for sale, and since the official suggested retail price is US$130, no shop will set it for any higher.

while you're there, keep on the look out for "bargain bins" with used copies of old(and not-so-old) DS games. my friend was there a few months back and he said some used DS games go for as low as a buck a piece.