Kmart offers the Hanes Boys' Short Sleeve Crew T-Shirt 5-Pack
. Opt for in-store pickup
to dodge the $5.75 shipping fee. That's $2.20 per shirt and the lowest total price we could find by a buck, excluding the below mentions. They're available in sizes M to XL.
Some close prices: Amazon
offers it in S for $11.20 shipped, while Walmart
offers it in sizes S to XL for $6.48 plus $4.97 for shipping.