"Save $10 when you purchase any 2 Nintendo 3DS games (34.99 and up)"
That's how it is advertised, but as of right now, the $10 discount is applying to individual 3DS games $34.99 and up in the checkout. Pokemon X/Y, OR/AS, Luigi's Mansion 2 and NSMB2 all receive the $10 discount in cart. Weirdly, AC New Leaf does not qualify for this (only one I've encountered so far).
Strangely, Bravely Default lists at $39.99 but get reduced to $20.01 when added to cart (http://i.imgur.com/0hZFL8l.png). It's sold out online but reserveable in some stores.
EDIT: Here's some links.
3DS games - http://www.bestbuy.c...b513d04ef5cen01
Bravely Default - http://www.bestbuy.c...b99dbb97403en02
EDIT 2: Looks like the deal is dead. Two games are required to get the $10 discount. Bravely Default doesn't get its own discount, but it does qualify for the save $30 on 2 promo (which we know so far to include BD, Yoshi's New Island and Kirby's Triple Deluxe). Sorry to anyone who missed out!