Around here they sell shoulder clod as “English Roast” and it’s often less than $3/lb. I did one (about 10 pounds) a few months ago in a different way. I rubbed it like a pork butt, smoked it at a low temp for about 3 hrs until the internal temp was about 125, and then put it in the freezer until it was pretty firm. I used my meat slicer to cut it as thin as I could (and still have the slices stay together) and made a big batch of Italian beef “gravy”.
I put the gravy in a crock pot on high, and set the sliced meat and some crunchy baguette rolls out next to the pot. The guests then served themselves by taking the amount of meat they wanted, putting it in a deep-fry basket, and putting it in the (vigorously simmering) crock pot. After about 30 seconds, the meat was hot and no longer pink, but still really juicy and surprisingly tender. They put it in the roll (dipped, if they knew what was good for them) with a little giardinera.
Everyone agreed that Al’s Beef or Portillo’s couldn’t hold a candle to it...