Thanks Iain.
 Amazon (US) shows the item, but as you say, reports it as unavailable, no knowledge of when available. Amazon UK doesn't list the item.

BTW, if I search for   "Amok Draumr 3.0 Flat Lay Camping Hammock with Tarp, Bug net and Suspension kit", on Amazon (US) then I get:
"Showing results using fewer words
No results for Amok Draumr 3.0 Flat Lay Camping Hammock with Tarp, Bug net and Suspension kit.", along with non-relevant hammocks.

Amok have set up outlets for various Northern hemisphere countries. Most are out of stock, the Canadian site only allows Canadian addresses in the order page.

The item is a Draumr camping hammock, viewable at Amok's website
Rather radical design - sleeping position is at 90 degrees to the ridgeline. A rather odd arrangement from an engineering perspective, but it's getting excellent reviews.

Edit:
FWIW, a rep from Amok emailed me to explain:
"Unfortunately we will not allow shipping to freight forwarding companies. I am truly sorry but we need a residential address in the US.
​There are several reasons for this, but one is that we are not able to offer customer service worldwide. Secondly, there has been a lot of fraud attempts, from allowing orders trough freight forwarders. Thus we have chosen to run a strict line when it comes to such orders."
​

Why not use a screen corral type program (eg Mouser's) and just have a quite thin vertical piece of screen reserved for your notification window/firefox window?
Pixel change notifier doesn't require the monitored window to have focus.