Totally worth it? I've been thinking about making these myself, I haven't found a place in Sydney that sells these (any form of good Mexican style food is hard to find).
The meat alone cost me 36 (before tax) and the peppers and spices about 10 to 15 (i have enough dried chillies leftover to do it again). These are NYC prices.
Buying birria tacos typically runs 12-15 for two tacos and a serving of consumme. Those tacos usually only have a spoonfull of birria, so I definitely think it's worth it.
With this amount, I'll be feeding for over a week. Whether it's over some cilantro lime rice, next to a nopales (cactus) salad, inside a quesotaco, over chilaquiles or nachos. It's definitely worth it.
We are even going to use the gloop (the gloop is the strained out onion, tomatoes, chillies, and tiny tiny melted beef fibers) to try and make some homemade birria soup dumplings.