Eddie Bauer offers its Eddie Bauer Classic Fit Legend Wash Short-Sleeve T-Shirt in 12 colors (Graphite pictured) for $20. Coupon code "TROUT" cuts the price to $16. With $7.99 for shipping, that's $4 off list price and the lowest total price we could find. It is available in regular sizes S to 3XL, but all size/color combinations may not be available.

Of note, it's available in tall sizes from M to 3XL for $18.40 via the above coupon. Shipping is $7.99. That's $5 off and the best price we could find.