Amazon has the Netgear Orbi Pro WiFi 6 Tri-band Mesh System (SXK80) for $350 with free shipping. List price: $800. Features includes router and one extender, covers up to 6,000 square feet, 802.11ax (WiFi 6).
Has good Amazon Reviews.
Amazon has the D-Link WiFi 6 Smart Mesh Router (DIR-X5460-US) for $117 with free shipping. List price: $250. Features compatible with Alexa & Google Assistant, up to 6 simultaneous streams. Connect more devices at faster speeds. Up to 4x greater capacity than 11 Ac, so more devices can connect at once.
Has good Amazon Reviews.
eBay has the Certified Refurb TP-Link N300 802.11n WiFi Range Extender for $11 with free shipping.
Amazon has the TP-Link Deco S4 AC1200 Mesh WiFi System 3-Pack (Deco S4) for $130 - $20 off coupon clip (Save 20) = $110 with free shipping. List price: $150. Features up to 5,500-sq.ft. coverage, capable of providing connectivity for up to 100 devices, parental controls. #1 Best Seller in Whole Home & Mesh Wi-Fi Systems.
Has excellent Amazon Reviews.
Amazon has the ASUS XT8 ZenWiFi Tri-Band Mesh WiFi 6 System, 2020 model (2-Pack, White, AX6600) for $380 with free shipping. List price: $450. Delivers strong WiFi to every corner of your home providing total wireless speed of 6600Mbps, up to 5500-sq. ft. coverage.
Has good Amazon Reviews.