What about this one?: https://www.ebay.com/itm/Atheros-AR9271L-802-11n-150Mbps-USB-Wireless-WiFi-Adapter-Wifi-Antenna-for-Win/352856112189?hash=item5227dcfc3d:g:EkAAAOSwU2Jdz-h-
It has a same chipset ( Atheros AR9271 ) like the one from FSF page you recommended:
https://tehnoetic.com/TET-N150HGA But it costs $13 instead of $80. Yes, sorry for the driver/firmware mix up. I think libre devices shouldn't be so expensive, for everybody could use it.
