Apple is selling the RBK23 three pack Orbi Mesh System for $300 and the RBK50, the higher end model, in a two pack for $329.95.
These routers all work in a similar way, offering up a main Orbi router and satellite nodes to extend WiFi throughout the whole house. Maximum Wi-Fi speeds differ between the two models, as do the number of satellites, so some research is required to find the Orbi system that best fits your needs.
The RBK50, which includes one router and one satellite, covers up to 5,000 square feet of space and offers Wi-Fi speeds of up to 3Gb/s. The RBK23 triple pack with one router and two satellites covers up to 6,000 square feet and offers Wi-Fi speeds up to 2.2Gb/s.
With the Orbi system, the idea is to put a single router in a main area like a living room, outfitting other areas further in the house with their own satellite routers so all areas of the house get the same Wi-Fi coverage with no dead zones. You can add additional Orbi satellites to a home setup at any time.
Along with the RBK50 and the RBK23, Apple also sells the CBK40, an Orbi router system that has a built-in cable modem that works with Xfinity, Spectrum, Cox, and others. It comes in a single router version that covers 2,000 square feet or a router plus satellite version that covers up to 4,000 square feet.
All of the Orbi routers are available from Apple retail stores and the Apple online store.