The Wii U Mario and Luigi bundle is on sale at Walmart for only $249 online! Since I started this post, it has sold out online, but it looks like many stores have it in-stock. I've only ever seen it for $299, so this is the lowest price I've seen. The Walmart flyer lists the price as $289, but you get a $40 Walmart gift card when you buy in-store.
I'm very excited about this deal as we've decided to get the kids a Wii U, and I had asked at various stores if it would go on sale. The answer was always "probably not". My mom is actually getting it, so I immediately sent her the link then wrote this post. I'm selfish like that. So, if you are planning on getting a Wii U, now is the time, because Walmart also has free shipping.
I did quite a bit of research on this, too. A number of stores have different bundles, like Zelda or Skylanders. I was at first keen to get Skylanders, since this is what my kids want, but upon further examination, that makes it a bad deal. The bundles are all the same price, but the Luigi/Mario bundle I have linked you to is a 32GB system and the other systems are only 8GB. The people I talked to said updates sometimes will take up 4GB, so you want as much space as you can get. Also, the games with this are worth about $90 and the games with the other systems are $60 - $75. This set is the best deal.
(Expiry: 28th November 2013)