This men's 6-Pack of Thermal Shirts is on sale for $17.99 at Woot. Shipping is free with an Amazon Prime account or when you sign up for a free Prime trial. Otherwise, it adds $6. That breaks down to just $3 per shirt. Other retailers are charging $10 each for these shirts! Please note that the colors you receive will be randomly selected. While duplicates are possible, you will receive at least four different colors.