Yes, GameBanana has all the Deluxe battle maps available for 8 Wii U, do note however that because of how the battle maps were handled in 8 on the Wii U that if you play a modded version of the game with the battle maps enabled, their normal race counterparts become tracks that you can not race on. Deluxe separated these map locations, but 8 on the Wii U combined them in such a way where you can't alter the battle map without also altering the race course it was made from.
As such, I might recommend you get
my suite of Mario Kart 8 modpacks, or at least just grab the Battle and/or Battle Lite modpacks from the collection of 6 modpacks. Battle LIte is just Vanilla MK8 with these Deluxe battle courses. It all has some new flair as well, but nothing that changes up how the game plays. Battle is the same as Lite, except some racers and karts have been swapped out for new ones. You can watch the video in that link to see what I'm talking about.