I was inspired after reading Kenny Shopsin's Eat Me to make some burgers with 75/25 chuck. I called Drewes Brothers on Church and when I asked them for fatty meat they acted like I was crazy and only offered me 80/20 ground Brisket. No good
The guy at Avedano's said "dude we grind our own meat , it looks fatty but I couldn't tell you the percentage". Oookay then.
I know trader joe's sells 80/20 but 1) who knows how fresh it is 2) I'd rather support my friendly local butcher shop than the fake hawaiian theme corporate behemoth that is Trader Joe's and 3) dammit, I want 75/25 ground chuck