Well to be clear those are probably not Nintendo bundles.
For example this is what I got, and it cost $300
I got this at Christmas.
As far as I am aware, this is the only software bundle they officially made for the US market. There may have been a Mario Party or Odyssey pack, but I don’t know that for sure.
The Pokémon bundle you see is probably just a third party reseller doing so to maximize their value by packing in extra cost with the guaranteed seller device.