The GameStop website is currently selling a online downloadable code for 12 months of Xbox Live Gold for just $39.99. That's a $20 savings compared to its normal $59.99 price tag. The codes are limited to emails with US addresses.
The membership is good for accessing, among other things, online multiplayer features for both the Xbox 360 and Xbox One. It also offers special sales and even free games every month for both consoles. Even at its normal $59.99 price level, you get your money's worth, and more, just with the free games, so this $20 discount makes it an even bigger value. There's no word on when this new promotional offer from GameSpot will end so it might be good to act quickly to secure the lower price.
Source: GameStop
Thanks to Paul for the tip!