Solty's Deli: It might not be great, but it's certainly convenient enough. Per Google, they are supplied (at least in part) by Crawford Sausage, whose products can also be found at Pete's Market and the Hyde Park Co-op.
They have a long fridge unit at the counter containing at least two varieties of polish sausage (smoked and fresh), various pierogis, and other deli items. The rest of the store has groceries (teas, candies, etc.) I seem to recall that they rent Polish movies there. It's largely a Polish-speaking affair, if that kind of thing affects your judgment of a place's credentials.
Solty's Deli
305 W Ogden Ave
Westmont, IL 60559
(630) 434-9129
- Peter