Ending today, Lands' End offers its Lands' End Women's Shimmer Down Coat in five colors (Darkest Burgundy pictured) for $199. Coupon code "HALFOFF" with PIN "9710" drops it to $99.50. With free shipping, that's $100 off list and the lowest total price we could find. It's available in regular and petite sizes from XXS to XL.
Of note, tall, plus, and petite plus sizes are available for $109.50 after the above coupon.