Get $5 worth of Video On Demand movie and tv show rentals for free from Amazon, when you link your Amazon account to your twitter account here. Amazon will then send out a tweet automatically to your timeline that says you got yours, and you'll see the $5 credit show up in your account. Then, you can rent several movies over Christmas break for nothin! Get yours here.
Then, check out the now over 2,000 free Mp3 song downloads you can get from Amazon here.