Model Number: WDT970SAHZ.
Additional $100 off from $649. Including installation and haul away from Costco. Comes with 2 years of manufacturer's warranty. If you purchase a Square-trade warranty through costco for $79 and pay with Costco Visa Card from Citi, you'll get a total of 7 years warranty. You pay less than buying from elsewhere but get more warranty, AND you don't need to pay for installation.
FYI, the same model sells for $512 on whirlpoolinsidepass.com but you have to pay $55 for installation and you only get 1 year of factory warranty.
Note: you need to uninstall the old dishwasher yourself because they will not uninstall it for you.