3rd party sellers are selling it for $20 more, and there is a reason for that. Because of people watching a switch they can potentially hack. Amazon is not selling it for $20 more nor do they appear to have any in stock atm and haven't since the MK8 bundle ran out.
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Man, they have confirmed updates and throwing out teasers for a "finished" game. Lot of effort being put into this "finished" game that clearly isn't "finished" because they are still actively working on it.
Let's be honest here- you took the bait they wanted you to with the "final splatfest". It's been clear more recently that it was just a red herring. The game is likely getting another xpac.