Edited June 26, 2018
at 06:31 AM
Costco has 70 pint Whirlpool dehumidifier with pump model WDH70EAPW for $159.99. It doesn't seem to be discounted but I checked around at various retailers for different brands with similar features, and it seems like best deal on name brand.
It is available for online order delivery at relatively low $10 shipping cost, and it should be in warehouses. I picked mine in Washington, DC metro area store.
Here is previous thread on this:
It has generally positive reviews on Costco site. Amazon has only three reviews there, mostly positive. In those reviews, most negative mentions are about poor customer support, and that some users had pump reliability issues.
That is where Costco comes in. If you are in a market for something like this, and the item has a weak point, you want to buy this from retailer like Costco. Their liberal return/exchange policies can be quite helpful if you are one of those who has problem with the item.
QA EDIT: Instore only now