I'll start with Nintendo.
Best Buy has the best deal I have seen so far:
A bundle with a 32gig Deluxe Wii-U, Mario 3D World, Super Smash Brothers, Donkey Kong Country Tropical Freeze and of course NintendoLand.. for $359.97 If you do not yet have a Wii-U, it looks like Black Friday is the time to buy!
They also have the 3DS XL paired with Mario Party Island Tour for $179 (which, BTW Kohls has for $149), eShop cards 15% off, and a Disney Infinity 2.0 Toy Box Starter Pack for the Wii-U at $39.99
Target on the other hand, has the individual game deals, with Super Mario 3D Land for $15, Mario Kart 7 at 50% off (so.. $30?) and a $15 gift card with purchase of Super Smash Brothers or Mario Kart 8.
The only hardware deal at Tarjete is a 2DS with Yoshi's new Island at $99
Besides a few old Wii games they appear to be trying to get rid of for cheap, you can get a 3DS XL with New Super Mario Brothers 2 for $149.
Amazon right now is doing its "countdown to black friday" deals, and those change daily. Newegg usually has some good deals too, but usually not on Nintendo stuff.
Expect a post devoted to Playstation deals, and a post about XBONE deals SOON.