Hi Steven,
Sorry, just now getting caught up on some posts.
If you're a Costco member, most any of their stores have pork butt. I go to the one on Senter Rd. and they sell two butts in Cryovac packaging. If you don't see them out in the meat case, just ask the butcher behind the window. If he doesn't seem to know what "pork butt" is, tell him/her you want the whole piece from which they cut the country style ribs.
If you're not a Costco member, try Cash & Carry on San Carlos Ave. in San Jose, just across I-880 near Valley Fair Mall.
Otherwise, you can get smallish ones at Nob Hill, Lunardi's, Cosentinos, etc. You will find some at Safeway and Albertsons, but check the label carefully to make sure you're not buying an
enhanced pork butt, which will taste kind of like ham.
Regards,
Chris