Essentials box still available anywhere?

I’ve been introducing friends through the beginner box. Of course, most of them like to use the miniatures where possible. Since we seems to have some quick games with two mechs per side, and because terrain seems to be the most fun part for making tactical decisions at this point, framing things as a gladiatorial match sounds fun.

I assume that the arena map sheet and the extra two miniatures, along with the map sheet and models from the (current) beginner box would make for some fun 2vs2 until I can either find a group that’s not stupidly far away or my friends want to start learning the full game rather than playing a quick match or two when we hang out.

I’m in the UK, so it’s not easy to find specific things at the best of times. I’d happily pay a little bit extra to get the Essentials box, although obviously it would be nice to get it at retail and not have to have it shipped thousands of miles.

Is it even still a thing, though? Even a used copy at a reasonable price would be fine as long as it’s in good condition.

Anyway, my searches have brought up nothing so I might as well ask the people who might know.