Factory Reconditioned: 3-Pack Linksys Atlas AX3000 Mesh Wi-Fi 6 Router $37 + Free S&H w/ Amazon Prime

This is an incredibly cheap way to get into a Wi-Fi 6 mesh at ~$12/AP. It's dual band only though, meaning no dedicated backhaul channel for nodes to talk to each other, which is expected to bottleneck performance a bit. However, for general use and just boosting coverage, it should be solid, especially for this price. Note - Factory Reconditioned.