I ordered a Sentinel last week. The shipping estimate to NY was around $73 but when i checked out it dropped to $30. After seeing this, i changed my order with Karen to two but then i got a email saying that my shipping was going to be around $150. I replied back to Karen on Friday to see what is going on. I will change the order back to one if the shipping is going to be $150 though. I only have a fairly small room of around 2000 cu. ft. but i though i would buy two considering the cheaper shipping and price drop when buying two.