Remember a time when Wii consoles didn't come with Wii Sports Resort and MotionPlus? So does Target, as it's still got enough stock of the old "Legacy" packs to advertise at a new low price of $150.
The chain is also selling Wii Remotes with MotionPlus attachments at $29.99, so even if you've already got a machine it might be worth a quick visit to pick up some extra goodies. That's what Target wants you to think, anyway.
If you're yet to dip your toe in the Wii water for whatever reason, this is as good a time as any.