I do wonder what exactly people are cooking. An uncooked pork shoulder will weigh in the 14 to 16 pound range and is comprised of the picnic roast and pork butt (also known as a Boston Butt). Since pulled pork is not a cut of meat, what exactly are people cooking ?
MD... Sometimes Hottingers has a good selection of Tri-Tip.
As Mark noted, It's one cut that demands careful attention to grain direction to achieve that 'melt-in-the-mouth' mouthfeel !
The bottom sirloin is not really a muscle of locomotion. Therefore it does not require the low and slow...
Online, I regularly watch Chef John (Food Wishes), Adam Ragusea, Arnie Tex, Ballastic BBQ, Big Poppa Smokers, Brian Lagerstrom, Joshua Weissman, Mark Wiens, Meat Church BBQ, My German Recipes, and of course Rick Bayless.