Free $10 Gift Card for Xbox Ultimate Game Sale YMMV
Signed into Xbox live about 11:30 pst and noticed I had received a dashboard text. I was confused because when I went to communication/conversations there was nothing there. I was about to chalk it up as a glitch when I noticed the 'Messages from Xbox live' option.
Clicked on that bad boy and was surprised to see this:
Here is $10 to kick off the ultimate game sale. Redeem by September 30, 2018 and spend within 90 days of redemption. See full terms at microsoft.com/cardterms
The code was included in the message, but so was another button to redeem the code and it was easy as that to add $10 to my account.
To clarify this was totally random, my account is actually silver, I game share with a friend and have to be signed in to his gamertag to be able to play under mine. Neither his account or a 3rd account on my Xbox received the text. Good luck.