Walmart offers the Where the Wild Things Are Boys' Cotton Tight Fit Pajama Sleepwear Set in most sizes from 4 to 10 (also in Superman, Batman, and Flash) for $10. Choose in-store pickup to avoid the $5.97 shipping fee. That's $3 off and the lowest price we've seen. A close price: Target's $10.49 with free shipping, in 3T and 4T only.