Both seasons of Justice League Unlimited are on sale this weekend for $9.99 each on Vudu. Season 1 is a great ride, but normally pretty expensive on Vudu for some reason. Justice League The Animated Series, the predecessor to this show, is not on Vudu as far as I can tell, just Google Play.
Some other DC shows are on sale for $9.99 per season too, including Batman Beyond, The Batman, Batman The Brave and The Bold, Krypton, and Smallville, among others.
The whole series is also on DC Universe if you just want to stream it.
https://www.vudu.com/content/movies/details/Justice-League-Unlimited-Season-1/248608
https://www.vudu.com/content/movies/details/Justice-League-Unlimited-Season-2/248650
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