Packaging
The line, in its various incarnations, has explored several types of packaging - single, 2-packs, 3-packs, 4-packs (as Justice League Toys "R" Us exclusives), 6-packs (as Target exclusives), and 7-pack (featuring the original members as Toys "R" Us exclusives both in the 3" and 4.5" scales.)
Once it was integrated into the DC Superheroes line, JLU sported redesigned orange packing, and followed suit when its 'sister' brand was redesigned with purple packaging in 2006. Since it was part of the DC Universe re-brand, the packaging was in a form of the DC Universe Classics packaging (including character bios) with animated touches placed on it. Beginning in March 2010, the packing changes to the DC Comics' 75th Anniversary brand.
4-packs have been available at the Mattel Collector site. These are not actual 4-packs per se, but singles that are bundled in four. These were discontinued in 2010 after the Justice Guild release, due to insufficient sales. Mattel continued selling exclusives on their site (though in a different format) starting with Lobo in April 2010.
Read more about this topic: DC Universe: Justice League Unlimited Fan Collection