Today only, Lands' End offers its Lands' End Women's Elbow Sleeve Ponte A-line Dress in Black for $69. Coupon code "CYBER30" and PIN "3101" cut it to $41.40. With free shipping, that's $28 off and the lowest total price we could find. It's available in regular and petite sizes XXS to XXL.
Of note, it's also available in tall and plus sizes for $6 more.