Walmart offers the Whirlpool 155 CFM Indoor Evaporative Air Cooler in White for $157.25 with free shipping. (Home Depot and Amazon charge the same.) That's the lowest price we could find by $12. It features three fan speeds, LED display, and automatic oscillation.

Update: The price has increased at Walmart and Amazon; however, Home Depot still offers it for the same price.

Update 2: The price has increased at Home Depot, but Amazon offers it for $157.25 after a clippable coupon.