Clothes for ANY kid under 2nd Grade or so, can be EASILY procured for next to nothing at LOADS of places.
Many people will get gifted the entire wardrobe for the little fuckers for the entire time, from older cousins, etc.
Then, after you pilfer your friends "garage sales" who aren't giving them away for free, you are still working on pennies on the dollar.
Finally, hit any freaking Kohls on the planet at the end of a season and buy the crap out of the next couple age groups up.