Columbia offers its Columbia Men's PFG Low Drag Polo Shirt in Steel or Sunlit for $40. Coupon code "CSPRING17" drops it to $20. Plus, Greater Rewards members receive free shipping. (Not a member? It's free to sign up.) That's $5 under last week's mention and the lowest price we could find by $16. It's available in sizes S to XL. Deal ends May 2.