Woman Within offers its Woman Within Women's Poncho Style Cowl Neck Sweater in four colors (Heather Grey pictured) for $29.99. Coupon code "WWB87646" cuts it to $17.99 and grabs $5.99 shipping. That's a savings of $44 and the lowest total price we could find. It's available in sizes S to XL.
Of note, it's also available in sizes XXL to 4XL for $20.99 plus $7.99 for shipping via the same coupon.