Macy's offers the Project 28 NYC Women's Lace-Trim Slip Dress in Black for $29.50. Coupon code "GIFT" cuts it to $23.60. Pad your order with a beauty item (they start at $3) to bag free shipping; otherwise, shipping adds $10.95. That's $35 off list and the lowest price we could find. It's available in sizes S to XL.