This is an exclusive partnership with Slickdeals [see article here for more details]:
The deal expires on April 15th, 2019 at 11:59 PM.
You have to click from Slickdeals to see the discounted price. Regular price is listed at $839.99, so that's what you'll see if you get there any other way.
For reference, here's the direct link to the product:
Runs a little big, but it's really good at cooling and reasonably quiet, according to reviews. Plus, B&H doesn't collect sales tax in a lot of states.