It's probably been well over a year or so now that they've stopped the import of Hikari. But if you keep your eye on eBay, you'll often find some (perhaps at a price).
I have heard many reasons as to why, i have even spoken to reps of hikari who gave me two completly different reasons. One as mentioned above. No one really seems to know or be letting on!
The last thing Hikari told the shop I work at was that it will be back in stock from the end of june onwards, but they have made empty promises since april last year!
Its a shame because my fish always loved the hikari carnivore pellets.