Update: That was very fast; the phone is no longer on sale, with the "Email me when available" listing back up.
That's the good news. The bad news is that just the white colored versions of the phone is available to buy, and not the black version. The listing also still shows a "Coming soon" date, rather than a specific ship date, so it's a crapshoot at the moment when the phone will be mailed out.
As we mentioned before, Microsoft's brick-and-mortar retail stores in the US are scheduled to begin selling the Lumia 950 XL on Thursday, November 26. Due to the Thankgiving Day holiday, some stores will have different store opening hours on that day.