Ugg Closet offers its Ugg Australia Men's Merrick Boots in Black or Stout for $132.99. That falls to $113.04 in-cart. With $8 for shipping, that's the lowest total price we could find by $6. They're available in sizes 7 to 15, although not in all size/color combinations.
REI offers the Bogs Kids' Digital Camo Rain Boots in Black or Olive for $34.73. Opt for in-store pickup to avoid the $5.99 shipping fee. That's $15 off and the lowest price we could find. They're available in sizes from little kids' 7 to big kids' 6.