If I were you, I would stick with the devices listed in the "Shop/ Wireless
networking" section of http://libre.thinkpenguin.com (they ship worldwide).
The point is: it usually is hard (if not impossible) to know what is going to
be the actual chipset the device is equipped with. The manufacturers sell
under the same brand devices with different chipsets. Some of them work with
Linux-libre, others don't. On the contrary, ThinkPenguin guarantees it will
work with Trisquel.
Moreover, by clicking on the link above (and not by accessing the site
without the "libre" in the URL), Trisquel receives 25% of the profits
ThinkPenguin makes on your purchase.