Eddie Bauer offers its Eddie Bauer Kids' Fleece Beenie in four colors (Peak Blue pictured) for $2.99. With free shipping via coupon code "25OFF", that's $10 off list price and the lowest total price we could find. It is one size fits all.
Ralph Lauren offers the Ralph Lauren Layette Girls' Gingham Cotton Bubble in Pink, Aqua Blue, or Key Lime for $20.63. Coupon code "PCN7392" yields free shipping. That's $12 off and the lowest total price we could find. It's available in sizes 3M to 9M.