Just follow this link, add all three items to your cart, and the $50 Amazon egift certificate will automatically be deducted at checkout. The bundle ships free with Super Saver Shipping!
Update: It turns out that you won't receive the gift card in time to take advantage of the games deal which ends 11/21. Hopefully you have some Swag Bucks that you can use toward games now, and perhaps we'll find a deal on additional accessories for the gift card.
If you have a Wii on your Christmas gift list, this is an amazing deal!
Thanks, More Than Cents!