It has shipped 100,000 copies in Japan since release.
It appears to have been a very off-hand experience. He explained the process in a talk with Herman Li of Dragonforce.
Yesterday the set started shipping out to the people who pre-ordered it and even though the release date is tomorrow (Wednesday 9th), many have already received it, some are going to get it today outside of Japan as well.
LEGEND – METAL GALAXY And “BABYMETAL Live Selection – Odyssey To The METAL GALAXY” To Be Broadcast On WOWOW
The first will be broadcast in April (day 1) and May (day 2), and the 2nd on March 15th.