Eureka Entertainment ran a sale on their website dedicated to Japanese films and they had two older releases that I had yet to pick up for the collection, both happen to be from Japanese director Ishiro Honda and are part of the Masters of Cinema range.
We have the Ishiro Honda Double Feature collection that includes the 1958 film The H-Man (美女と液体人間) and the 1959 film Battle in Outer Space (宇宙大戦争), both are science fiction stories that I hadn't heard of prior to Eureka's release, and this is the second print edition that doesn't include the slipcase but kept the booklet (which will go away in the next print run).
And there's also Mothra (モスラ), the 1961 Japanese film and debut of the iconic Kaiju monster. This is the standard edition version which loses the rigid slipcase but still comes included with a booklet (which will also go away in the next print run).