Edited October 14, 2020
at 02:29 PM
My local Costco on Coleman Ave in San Jose, California had a big stack of Yamaha TSR-700 receivers for $399.99. It does not show up online. TSR-700 appears to be a Costco rebrand of the new RX-V6A which just came out in the last week or so. The RX-V6A is normally $600 and RX-V4A is normally $440, so getting essentially an RX-V6A for $400 seems good.
This receiver has 7.2 channels, 7 HDMI in (some of which will handle 4k/120 and 8k/60 resolutions after future firmware upgrade), Atmos, Dolby Vision, etc.
There are not many reviews for this since it just came out, but there is an RX-V6A and RX-V4A Owners thread
Find a Warehouse: https://www.costco.com/