There's a $25 one, https://www.thinkpenguin.com/gnu-linux/penguin-wireless-n-usb-adapter-gnu-linux-tpe-n150usb
but no, your WiFi card will not work without proprietary firmware.I'm not too familiar with LXDE (the desktop environment for Trisquel Mini) but you might be able to find what you're looking for under "System Tools."
