Amazon offers Prime members the Ralph Lauren Layette Bal Harbour Repeat Slip-On Shoes in White for $8.40 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $5.48.) That's the lowest total price we could find by $7. They're available in infant sizes 0 1 to 3 and toddler size 4.

Also available are the Carter's Kids' Avery Sneakers in Camo/Neon Pink or Silver for $10.50 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $5.48.) That's the lowest total price we could find by $8. They're available in toddler sizes 5 to 10 and little kid size 11, although not in all size/color combinations.