Animal glycerin is cheaper.
not that much animal left in the US. As far I know, there are only 2 places still messing around with it. (One of them in my backyard).
Keilim is still an issue though. The places still doing animal are large facilities and also doo vegetable.
Also, an up and coming issue is renewables (spent fat).
Seeing quite a few places refining nad they can still call it vegetable