Search eBay for "KidsCom DVD" or "Scholastic fighting game 2003." The artwork usually features three cartoon characters: a punk girl with green hair, a nerd with glasses, and a jock holding a slushie. Be wary of bootlegs. The genuine disc is purple on the data side and has a small "Sagacity" logo near the center ring.
If you manage to find an ISO rip or an original disc, here is what the Fighting KidsCom DVD Full offers that the web version did not:
The search term "fighting kidscom" might be a typo or a misremembered title. It is highly likely you are looking for one of the following:
You cannot buy this at Best Buy or Walmart. However, as a physical media archaeologist, here are the three primary methods to locate the complete version.