I've resorted to Kijiji and Poshmark to acquire used (and new, apparently!) Asus RT-AC68U routers. Mainly to flash the firmware. They are tanks + I personally don't care if you have a 3GB fibre now and need a "faster" router, or have upgraded to a mesh network. Thanks for flooding the airwaves with your hidden back channels and good luck with that.
What else do people reliably use to install DD-WRT or FreshTomato these days? Do most just not do that anymore?