Crocs offers the Crocs Kids' Crocband LEGO Mammoth Clogs in Sea Blue/Red (pictured) or Neon Magenta/Neon Purple for $29.99 plus $4.99 for shipping. (Dick's Sporting Goods has them in Sea Blue/Red for the same price.) That's $10 off list and the lowest total price we could find for this style. They're available in children's sizes 6/7 to 12/13 and juniors' sizes 1 to 3, although not in all size/color combinations.
Of note, Amazon offers the similar Crocs Kids' LEGO Backstap Clogs in Black/Sea Blue, Sea Blue/Red, or Yellow/Sea Bluefrom $26.69 with free shipping. That's the lowest total price we could find by at least $10. Sales tax is added where applicable. They're available in toddler's sizes from 4/5 6/7 to 8/9 or little kids' sizes from 10/11 to 3, although not in all size/color combinations. Update: The price has increased slightly to $27.39 with free shipping.