Proozy offers the Under Armour Boy's Mystery T-Shirt 5-Pack in assorted colors for $54.99. Coupon code "PZY40" cuts that to $40. With free shipping, that's tied with our December mention and the lowest price we could find for this quantity by $4. It's available in sizes XS to XL. Note: Styles are selected at random.
If you know where to look, you can score freebies at the dollar store regularly.