Xbox Live Gold Trial codes ranging from 14 day to 2 day.
Just found these, I don't think they have been redeemed, not sure if they expire though.
I think these only work when added to a silver account, if you would like one send a PM and I will reply when I can.
3 - 14 day available
1 - 7 day available
1 - 2 day available
The above codes are still showing as usable on Xbox.com as of 11am today if anyone is interested.