If you don’t feel like grocery chicken, which I agree can be quite good, you could always go to a place like Dinah’s.
I mean they have a menu lines for 50, 75, or 100 pieces of chicken.
There are two locations, I don’t think they are related anymore and I really don’t know if either one is better than the other.
Dinah’s Family Restaurant - Sepulveda in LA (near Westchester)
Dinah’s Chicken - San Fernando Rd, Glendale