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Since I got my Wii U I've pretty much stopped paying attention to sales, however one place I can recommend checking out CAG (abbrv. because of language I guess, something like that). It's basically a general hub of everything gaming deals so I'm sure you'll find something for Wii U sooner or later.
Sorry for no direct links to a place selling Wii U's for cheap but I hope that helps.
Thank you!https://store.nintendo.com/ng3/browse/productDetailColorSizePicker.jsp?productId=prod560316
Theres this, which is 225, and has Super Mario 3D World and Nintendo Land