Macy's offers the Under Armour Men's Threadborne Thermal Under Shirt in several colors (Arden Green pictured) for $14.99. Pad your order with a beauty item (they start at $3) to bag free shipping; otherwise, shipping adds $10.95. That's the lowest price we could find by $9. It's available in sizes S to XXL. Deal ends March 17.
The planet will thank you, your local (overwhelmed) landfill will thank you. Even your budget will thank you.