Macy's offers the ID Ideology Men's Body Map Jacquard T-Shirt in Grey for $11.93. (It's also available in Charcoal for $15.) Pad your order with a beauty item (they start at $3) to bag free shipping; otherwise, shipping adds $10.95. That's $18 off and the lowest price we could find. It's available in sizes S to XXL.
These freebies are available to anyone with an internet connection — including those without an Amazon Prime membership.