I bet it's because it was recently announced that the Mario Maker 1 servers would be shutting down. There's a group called Team 0% that is trying to finish every unfinished level in Mario Maker. There's a push in the community to get everyone to help. I wouldn't be surprised if this person bought a Wii U to help.
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Here's a YouTube video about it (2 mins 54 secs)
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that thing i so getting homebrewed.
Where to find the wii u stuff these days? Isos and such
https://github.com/FailedShack/USBHelperInstaller you might start here for a program to download them. it'll ask for "that title keys site" which will be literally the first result on google for that search.
https://github.com/cemu-project/Cemu/releases here for an emulator
https://wiiu.hacks.guide/ or here for how to homebrew your own wiiu.
Where can I buy a new Vita?
This has to be old or a reseller
Yeah, if I could buy one still mint in the box MSRP I would do it today
