My normal brand is royal oak, around here it is seasonal so now there is none. Grabbed a bag of BGE and paid too much for it, lots of small stuff in bottom of bag. Next I got Wicked Good Weekend Warrior. So far out of that bag I've gotten 3 rocks,(no problem just removed them) and 1 piece of insulation (not so good) and still have half of it left. I have also gotten bad stuff in cowboy a couple of years ago so dont use it. I would try the wally world in a pinch but royal oak will still be my go to lump. And yes I know they make the BGE lump.
X-Large Big Green Egg