find away to destroy your tranny if your under warantee still
That won't do it. I had this same question when I was a n00b and wasn't thinking.
You'd have to destroy the car to change it from auto to stick. It's not only the tranny. It's the shifter, the clutch, the gauges, I'm assuming the ECU... lots of things. It could be done, but why would you want to?
The reason it seems like so much ($7k) is because you're comparing used to new. If you look at your exact same car, from the same year with the same mileage, you could probably MAKE money by going to a stick.