Samsung offers a $50 Best Buy eGift Card for free when you register for this online offer and activate Samsung Pay with a valid credit or debit card on an eligible device. (You'll receive the gift card via email within four weeks of activation.) That's the best offer we've seen for a Best Buy gift card this year. Samsung Pay allows you to use your mobile device to make in-store purchases with select credit/debit cards; compatible devices include the Samsung Galaxy S6, S6 Edge, S6 Edge+, and Note 5. Note that Samsung Pay is only available with select wireless carriers and banks. For more information, click here. Deal ends December 31.