There is a new Theraflu Rebate.
Purchase (1) Theraflu Warming Relief® Syrup or Caplets (excluding trial size) between 12/19/11 and 3/31/2012 and receive a $5 gift card by mail. For ease of finding, click on health care on the left-hand side bar.
Be sure to print this Theraflu Rebate now and wait for a good sale. Unfortunately, you can only access it once (and I imagine it will go fast).