Paper Mario: Sticker Star is only $8 today (regularly $40), at Best Buy. You might want to go check it out. It's in-store pickup only, and I think it's US only as well.
Also, their website seems to be on the fritz, I looked up where the nearest store which had it in stock was, and it said like 200 miles away, but then I walked two blocks to our nearest location, dug through their game section, and found a copy hidden behind a few copies of the Wipeout game. I've heard a buncha reports on Reddit of people finding a copy in stores that were "sold out" as well.
Seriously, I wasn't even planning on playing this one, but 80% off? sure, I'll take it.