ASUS RT-AC68U - Using a USB WI-FI Dongle

Netgear A6210 USB 3.0 AC1200 WiFi adapter based on mediatek chipset and is supported according to previous posts, one of which is here: Openwrt x86 Netgear a6210 AP mode how to There are other threads which go into more depth to confirm it works but I am lazy and only c/p the first one to come up....
I researched this enough that I bought one on amazon for $20 used with stand and 1 foot extension cable and am waiting for it to show up. If OP is interested I will update thread after it arrives and I give it a good thrashing. And oddly enough it's going in the back of an AC68U as well. One nice thing about the A6210 is that the junky collapsible panel antenna is actually removable and is connected with u.fl connectors so if one would wish they can get u.fl to sp-sma adapters and use 2 of the AC68U's stock external antennas on the R6210!

Op, what are your intentions with the AC68U? Mine is wired only and used as a router+nas and for this it works well. Esp when overclocked but I got that Netgear A6120 WifFi adapter on order for iot isolation as well as guest WiFi isolation.

BTW that RT4230W sure looks yummy but they are about $40-$50 on ebay and much much more on amazon. where to get for $20?