Earn a Free $10.00 Barnes & Noble eGift Card with purchase of $100.00 worth of Gift Cards and/or Barnes & Noble eGift Cards at Barnes & Noble.com.
so you can buy one gift card first, and pay your NT by gift card. than you can earn a free $10 egift card.
please refer to below link
The only downside is that if I return the NT after buying it with gift certificates, they're supposed to give me store credit only.