Thanks Brent. Yes, I have had a challenge finding pork butt too. I spoke with our costco butcher, asked how come they don't have any, and he said it's what they use for all their ground pork. But that if I came in at 10:00 am, I could ask him for a picnic (guess its the same thing) and he'd not put it in the grinder.
I have yet to see brisket, but i have not looked very hard for it. I want to try spare ribs too. So I think a trip to TnT (and a re-fill of the propane tank!) is in order.