Where can I find AC right center AC grille and How do I replace it?

I cracked the passenger side center AC grille plastic.

I googled, maybe I am using the wrong name of the part, can't seem to find the replacement grille!

please help it's my GF's first new car, and she will kill me if I tell her before I figure out how to fix it!

The parts I am finding are about $100, does that look like the right price? It seems like the whole assembly, can I not just buy the grille?

Also, need help on how to actually replace it.
Please help! I am an idiot.