considering the labor and parts that goes into a transmission, 800 is about the cheapest you'll get (even having the one on your car rebuilt). Even from a junk yard (usually not guaranteed to work) you'll end up spending 400 at least. Do check around with the salvage yards though. you might get lucky.

 

You might get a better responce if you started a thread about this.Not to many people will look at a climate control thread hoping to sell a transmission