Wlan chip with free firmware:
http://jxself.org/ath9k-htc/version-1.3.2/

can be bought here:
https://tehnoetic.com/tehnoetic-wireless-adapter-gnu-linux-libre-tet-n150

see also:
https://fsf.org/news/tehnoetic-wireless-usb-adapter-now-fsf-certified-to-respect-your-freedom