Lord & Taylor offers the Ralph Lauren Infant Boys' Plaid Cotton Blake Shirt in Blue for $13.27 plus $5.95 for shipping. That's the lowest total price we could find by $16, outside of the mentions below. It comes in sizes 9 months to 24 months.

Close prices: Nordstrom has it in Pink Multi for $19.75 with free shipping, while Ralph Lauren has it in Blue Multi and Pink Multi for $14.99 plus $5 for shipping. (Choose "Economy" during checkout.)