Uniqlo offers its Uniqlo Women's U Cotton Crewneck Sweater in four colors (Olive pictured) for $29.90 plus $5 for shipping. (It's available for in-store pickup in select states.) That's $10 off list and the lowest total price we could find. It's available in sizes XS to L.
J.Crew offers its J.Crew Women's V-Neck Merino Wool-Cotton Sweater in Baroque Blue for $24.99. Coupon code "HAPPYSPRING" cuts that to $17.49. With $5 for shipping, that's $52 off and the best price we could find. It's available in sizes 3XS to M.