Ending today, Ralph Lauren offers its Polo Ralph Lauren Men's Merino V-Neck Cardigan in Windsor Heather, Hunter Navy, or Armadillo Olive Heather for $53.99. Coupon code "FROST20" cuts it to $43.19. With $5 for shipping (choose "Economy" at checkout), that's the lowest total price we could find by $117. It's available in sizes M to XXL, although not in all size/color combinations.
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