Yes, yes, I know, it's to promote their current winter sale on GOG, but damn it it's one of the only ways to even get NWN1 and NWN2 these days. So, if you know anyone that doesn't own the game but still wants to try it, now's the time to claim it for their GOG library. The offer is valid until December 3rd, 10:59 AM UTC.
https://www.gog.com/You still need to message support to request a CD Key, however, if you don't have one already.