This will probably not help you much, but if you are willing to drive to GSO, add a day, fly into Orlando/Sanford, which will require a car, or other transportation to get to WDW, you can fly for $112 round trip. Allegiant air is adding service from GSO to Orlando/Sanford, and having a great sale doing it.
Our January trip on SW was disappointing as far as costs; inspite of watching for DINGS, cheaper rates, etc. I was never able to get my flights any lower than $175. You may have difficulty also since you are trying to fly on a Friday and a Sunday. In my experience, these are the least discounted days.