Shopcounts offers the Hanes Men's ComfortSoft Long Sleeve T-Shirt 4-Pack in Steel, Navy or Black for $29.99. Coupon code "dealnewshlscs9" drops it to $18.49. With free shipping, that's the lowest price we could find by $10. They're available in sizes S to XXL.

Of note, the white and multicolor packs are available for $2 more after coupon.