Where is the best place to farm dragon vanities?

I am wondering where the best place is to farm dragon vanities.
Any advice would be helpful.

Mount fang - crypt
Mount fang - vampire feast

Any boss may drop them. Vamp feast prolly best (it's free and has all bosses), also not mentioned here the epic feast. Epic is the same as vamp feast but is a pay turnstile map.
Advice- use as many luck elixirs as possible, shamrock is best and priciest. Try to use the blessings free stacking elixirs if no shamrock.
It takes forever sometimes to see one drop much less be the lucky one who gets it.
Good hunting

Mount fang---Vampric feast