They’re expensive everywhere if you’re getting the originals. A few years ago someone re-issued the spectrum of death album, but now the band has officially released this “thrashaholic” collection with both albums and the DVD. This is where you can officially buy it (I dont know what shipping is to japan, but if it seems really expensive contact me and i’ll get you one).
my purchases for the last few days:
blessed curse - blessed curse
burzum - umskiptar
decimator - bloodstained
hellvetron - death scroll of seven hells and infernal majesties
lastwar - skazani na zaglade
mutilation rites - empyrean
nightmare - misterium przeklenstw
witchaven - terrorstorm
a few pieces of nice old polish thrash!