Kohls offers the Nike Men's Racer Performance T-Shirt
in four colors (Charcoal pictured) for $16
for shipping. Outside of the mention below, that's the lowest total price we could find by $5. It's available in sizes S to XL, although not in all size/color combinations.
A close price: Nike
offers it Black/Light Photo Blue for $24.97 with free shipping for Nike+ Members. (Not a member? It's free to join