Macy's offers the Calvin Klein Men's Textured Print Cotton Shirt in Mint Splash for $23.93. Pad your order with a beauty item (they start at $3) to bag free shipping; otherwise, shipping adds $10.95. That's $46 off list and the lowest price we could find, excluding the mention below. It's available in sizes S M to XL.

Note: Lord & Taylor has it in Blue or Pink for $17.37 $20.85 with free shipping. It's available in sizes M or XL.

Update: The price has dropped to $20.86.