Those of us who follow ChNN follow what ChNN has to say. In this case, he says buy meat from markets, as many kinds as possible, sausage is better since it is made from the meat of many animals. When used in a ganapuja, it creates a cause for that animal's liberation.
well, not only his dzogchen group did that (i didn't know his community did that, since i have never joined any). I met several people from their group in other nyingma events though, yes they were more... 'enjoying' themselves with those special food or drink, which was not a bad thing i guess.
I guess it's fine in western world, because those animals were killed and in supermarket already, it's not like in india or tibet when you order meat the butchers killed animals for you in the earlier day. And to be honest, many of us do eat killed animals meat anyway, in puja or not.
There are really two views of this, one is mainly from great dza patrul rinpoche, as in Kunzang Lama Shelung he suggested that offering killed meat to wisdom deities is like offering a killed child's meat to his mother. Quite convincing i have to say. While Dudjom Lingpa described in his autobiography that meat offering is quite necessary especially for like wrathful dharma protectors. "We protectors also like what you practictioners like to eat" dharma protectors told dudjom lingpa in his vision. I am not sure if that means protectors will like vegetables if the practitioner is a vegan.