**Appears that the item was added online but not for shipping. It will at least help to see store inventory and allow you to place an order online if you wish.
Taken from the forums of blu-ray.com
On Best Buys main movie page under weekly deals.
$19.99 The Avengers Blu-ray 3D Combo Pack
Exclusive set includes 3D version of the movie, character guide, and lithograph card.
SKU = 6571643
This is an in-store item only so no online stock checker. (NOW AVAILABLE ONLINE! Link above)
What's in the Box:
4-disc 3D blu-ray version of The Avengers (3d blu-ray, 2d blu-ray, DVD, Digital Copy)
208 page Hardcover book with artwork
$30 gift card to Sideshow Collectables (reportedly expires 9/25/2013)
7x9 inch Litho Card
The box itself lights up with a button
For those of you who have been doing the daily Facebook polls, this could be the perfect item to use that Facebook offer of getting 500 rewards points back for spending $10 effectively making this gift set $10
edit: Just got back from purchasing two copies. Price rings up $19.99 in store so no worries there.
also added a picture of the front and back for anyone interested.
All indications are that this sale should last a week but Best Buy is known to abruptly stop a promotion. Or the store could simply run out.