I'm based in the US. Most of those options are available from Amazon.
I've owned both the Viture glasses and the nreal air (back when they were called nreal rather than xreal). The picture quality on them is more than enough to use as a second display, but where it shines for me is on flights. It mostly just looks like a normal pair of oversized glasses, but presents an incredible display on that is miles beyond any in flight entertainment system.
I only bought the Viture because I lost/forgot my original nreal air glasses on a flight and they were never found.
I've owned both the Viture glasses and the nreal air (back when they were called nreal rather than xreal). The picture quality on them is more than enough to use as a second display, but where it shines for me is on flights. It mostly just looks like a normal pair of oversized glasses, but presents an incredible display on that is miles beyond any in flight entertainment system.
I only bought the Viture because I lost/forgot my original nreal air glasses on a flight and they were never found.