^ right,
I've often bought meats and such at Costco, including their shoulders. I only buy their shoulders because I am with a group, it's economical, and I'm not paying. I don't generally like them because they are only ever boneless. I prefer other local options when I can find them, and have had great luck keeping low temperatures with my old trusty flower pot in the past, but that is long gone. Yeah, I always brine them in molasses and pickling salt, primarily...mostly out of habit. I don't think it's necessary. (Fine for pork, I think: but a complete waste of resources for poultry in my experience: dry brine and air chill or go home, imo)
In this most recent case (2nd cook with the kamado-egg), I managed to snuff the fire at some point. I started at 9:30 around 230F, and that maintained temp for about 2 hours, I could still see some red glow looking down into the narrow vents, until I forced my OCD ass off to sleep. I inadvertently woke up at 5:30, went to check on it. Fire was out, temp was at zero in the kamado....oh shit. Pork was still rather warm (this is why I love ceramic), so I tossed it into the oven at 225 for the rest of the day. Shameful, in a way, but I've always had success with ovens when I can't actually smoke it...so whatever.
All of that being said...when one treats a pork shoulder as they tend to treat it: brine/rub/smoke and/or thick sauce at the end...I think the sourcing hardly matters, no? Shit it still good, and everyone is happy.
I try to get large ones and as long as they get good smoke, they are good in the fridge for at least 2 weeks if you still haven't finished it.
...These days, I'm just not liking what I see at this local Costco. Then again, I've gone on several beef sorties only to return home empty. A lot of it is due to just not finding any good looking cuts (I'm only going to the easy spots right now), but also because beef prices have spiked quite a bit, so I just don't want to spend the $$$ on the only cuts that actually look good.