Sales at US retailers dropped in September by the most in three years due to increased job losses, plunging home prices, and the deepening credit crisis rattling consumers. ┬á Purchases fell 1.2 percent, more than forecast, followed by a .4 percent decline the prior month. ┬á Consumer confidence is down, largely due to last weekÔÇÖs big decline in stock prices, the largest in at least seven decades. Consumers are cutting back on non-essentials like new cars and vacations, leading to an even deeper economic slump.