This NewAir AC-10000E 10,000 BTU Portable Air Conditioner drops from $519.94 to $399.95 at Air & Water, plus it ships free. Even better, add the code SPAC7010 and it drops to $329.95. This is the lowest price we could find on this unit by more than $70. It is well reviewed and cools up to 325 sq. ft. It is also designed to eliminate excess moisture and comes with an air filter for cleaner, fresher air. Plus, it comes with a one year warranty. There is no sales tax (except CA).