Groupon offers the Privagio Men's Crew Neck T-Shirt 6-Pack in Black, White, or Mixed 2 for $9.97 plus $3.99 for shipping. That's $67 off list and the lowest total price we could find. The shirts are available in sizes S or M, although not in all size/color combinations.
Sears offers the Covington Men's Crew Neck T-Shirt in ten colors (True Blue pictured) for $5.99. Coupon code "BEACH15" cuts it to $5.09. Opt for in-store pickup to avoid the $5.75 shipping charge. That's $11 off list and the lowest price we could find. It's available in sizes S to XL.