If you care about my story and how I can offer them:
I work for Microsoft in the department that is control of the codes. I created my own code generator and can whitelist every code I create. That means you won't get banned by using the Free Xbox Live Codes I can offer you.
All I ask for you is not to sell the Free Xbox Live Codes you download here.
You will download a file called Free Xbox Live Codes. In it is a new code. Once I see it is registered, I will upload a new Free Xbox Live Codes for you to download.
If you try the code and it has been used. Wait a few hours and download the file again. I will have updated the Free Xbox Live Codes and you are good to go.
Click the picture below to download your Free Xbox Live Codes.