A friend from us ABitOddish has spotted the existence of these GX Challenge boxes at Walmart. These are new releases.
Pokemon released these boxes under another GX Challenge box before, but only of Solgaleo and Lunala GX. This has different content. These boxes are priced $29.98.
What is new, is that these boxes include a exclusive holo version of former non holo rare cards. Very interesting if you collect any of these different versions.