root tantra of Kalachakra says:
people, hard to train.
Kill harmless beasts
As sacrifice to gods and for their ancestors,
To gain protection, profit, and fulfil their aims.
To buy the meat, to wish to eat it, is indeed an evil act.
Shabkar says: This passage shows that if one wishes to eat meat
and buys what one knows has come from animals that have been slaughtered
for commercial purposes, one commits a negative action.