As a UK resident, I can't order it, it's showing as unavailable. It's on the UK site but it costs £25.
It might be worth reading the 4K Dredd thread over at Blu-ray.com
It's seems there isn't a perfect version of the film. I believe the US 4K by Lionsgate has the best picture but another region has the better sound quality.
In terms of normal Blu-ray, apparently the Japanese release is best but that's now expensive and hard to find.
Thanks for the tip though, may it make many Irish Dredd fans happy.