from Nintendo’s Facebook page:
Heading to Best Buy? Connect your Nintendo 3DS to Nintendo Zone and use your system as a coupon to get 50% off select Nintendo 3DS titles! To learn more, visit www.nintendo.com/3ds/hotspots. Like this post if you’re ready for savings! US only.
Nintendo hasn’t stated specifically what games would be on sale, so I guess you have to head on over to your local Best Buy to find out.