This seems like an interesting deal for $29.99:
NETGEAR 4-Stream WiFi 6 Dual-Band Gigabit Router (WAX202) – AX1800 Wireless Speed (Up to 1.8 Gbps)
I don't see official OpenWrt support, but a quick web search suggests that maybe this commit just needs to be ported to official OpenWrt:
ramips: add support for Netgear WAX202
That commit claims that the device has 512MB of RAM and 128MB of Flash.