Lands' End takes up to 60% off select men's, women's, and kids' clothing. Plus, take an extra 20% off via coupon code "BIRTHDAY" and PIN "1616. Shipping is a flat $8, but orders of $50 or more bag free shipping. A couple best bets, with prices after coupon and free shipping:
Lands' End offers its Lands' End Men's Slim Fit Long Sleeve Seaworn Henley Tee in four three colors for $9.99. Coupon code "BIRTHDAY" with PIN "1616" cuts it to $7.99. With $8 for shipping, that's $20 off list and the lowest total price we could find. It's available in sizes S to XL, although not in all size/color combinations.