Netgear Orbi Whole Home Mesh Wi-Fi System with Advanced Cyber Threat Protection, 3-pack (Model RBK53S-100NAS).
Coverage up to 7,500 sq. ft with AC3000 speed
Costco has $80-Off regular $399 price bring it to $319.99 for one router + 2 satellites. We have seen this in the past for $300, but still a good deal if you did not grab it back then.
Also, if you have the Costco Citi CC, this would qualify into the +2 extended warranty, which makes this a really good deal.