I think they come with long lead times from Samson, so you may be in between production/import cycles, if availability appears scarce currently.
I'd reach out to some of their dealers and inquire into ordering one in for you, unless one pops up on the EE. Alternatively, you could ask Irunguns to import you one.
A quick Google search shows CSC had them but is currently sold out. Might be worth calling them about though, I've always had great customer service at CSC.
I know I wanted one of their stocks earlier this year but I abandoned the idea when I found out it was going to take a while to arrive.
Best of luck with the build!