No such thing as a stupid question. The Walmart 100-Page Giants were a series of 100 page anthology-style books that debuted as an exclusive Walmart line in the Summer of 2018. They featured a mix of brand new and reprint content.
The initial line carried on for well over a year, before a new assortment was launched in the Fall of 2019, at which point the line was no longer exclusive to Walmart. They got the books first, but comic stores would then get them approximately three weeks later, and with brand-new cover art, as opposed to the Walmart editions which typically featured cover art that was repurposed cover or interior artwork from the reprint-based content.
Here’s a cover gallery if you’d like to track them down at some point:
Wonder Woman 100-Page Giant volume 1 (the Walmart exclusive series)
Wonder Woman 100-Page Giant, volume 2 (This is the series whose issues initially debuted at Walmart, and then at comic stores a few weeks afterward)
#1, Walmart edition
#1, direct market (comic stores) edition
#2, Walmart edition
#2, direct market edition
#3, Walmart edition
#3, direct market edition
#4 (final issue), Walmart edition
#4, direct market edition
The 100-Page Giant line ended in April of 2020 and at Walmart, it was replaced by the bundles program, which is still in place. In the bundles, are four assorted comics and a poster of some type that features comic artwork for $8.99 per bundle. The bundles are quarterly releases with a new group of them being released every 3 months/retail quarter.
The total amount per release is usually at least 5 bundles, but there have been instances where a release featured 7 or more bundles, as was the case in March of this year.