This is either a smart move by Amazon or just a coincidence. A few days ago I mentioned that Battlefield Hardline is available for open beta play and pre-order, and today I saw that Amazon is selling 12-month Xbox Live Gold memberships at a discounted price of $39.99, normally $59.99. If you're not a member yet or are up for renewal, you may want to jump on this deal since it probably won't be up for too long. There doesn't appear to be a limit on how many you can purchase at once and you can choose between a physical card or an online code.
If you're wondering why you should consider Xbox Live Gold membership, one of the many reasons is free games every month along with other benefits, such as access to music and video streaming apps and services, and free movies and shows from providers like Crackle. Enjoy!