That's interesting. I used to buy the "mush" at Jewel on Ashland/Diversey because it was not worse than, and probably better than, the much more expensive "tubed" polenta. Also, I believe white corn or hominy was used, whereas most intubated polenta is yellow.
Polenta in tubes is pretty widely available, usually in the "Italain" section of the grocery store.
As regards country ham, of course they always have it at Paulina. Also, there among the Balkan, Asian and Mexican cured meats at Devon Market (across from La Unica) they sell small packs of "scraps" from very credible Tennessee country hams. I need to get back up there to replenish my supply.
No lard is used in the tubed stuff. I simply think that time physics force the much into a form that stands up to frying better than what one can do at home with loose mush.
I've had mush on my mind lately. I picked up a bag of Goya yellow cornmeal, the perfect grind for a Cuban tamal en cazuela. El Mercado on Southport has a wide variety of non-Mexican-masa corn products from South America and Italy. Don't know about tube, though.