As noted elsewhere already, and on display in Japan, there will be a second chance for people to get Prime Trilogy Repugnus and Grotusque, as they will be released in Japan in January as a special 2-pack, for about 7000yen.
However, it will be a TakaraTomyMall exclusive, so it's availability will be limited there too. (HLJ doesn't carry TTM exclusives)


Official images have been released, but these could just be Hasbro official images, as they appear to be identical to the Hasbro toys, and no packaging is shown (which will obviously be unique, as it is a 2-pack).
The Japanese release may well be identical, but with Doublecross being slightly different to the Hasbro version, it would be a nice incentive to get the other two to go with it if they were also slightly different in some way.
(there is a chance that Repugnus won't have its Prime Master, as it probably won't be an element/theme that is acknowledge in this 2-pack)