Amazon has 6-Pack Hanes Men's Cotton Moisture-Wicking Crew Tee Undershirt (Various) for $15. Shipping is free with Prime or on $35+ orders.

Thanks to Deal Hunter doublehelixx for finding this deal.

Available:

• Black/Grey/Blue Assorted (M-3XL)
• White (M,L)

Target also has 6-Pack Hanes Men's Cotton Moisture-Wicking Crew Tee Undershirt (Various) for $15. Select free store pickup where available, otherwise shipping is free w/ Target Circle Card, Target Circle 360 Membership, or on $35+ orders.

Available:

• Black/Grey/Blue Assorted (S-3XL)
• White (S-XL)