This is only 5 Euros (in Berlin). TP Link TL-WN722N https://www.ebay-kleinanzeigen.de/s-anzeige/wlan-stick-usb-2-0-150-mbit-s-tp-link-tl-wn722n/433480840-225-9660
and according to h-node, it works with Trisquel, https://h-node.org/wifi/view/en/357/Atheros-Communications-Inc--AR9271-802-11n
