Since moving to Chungju, I've checked out the selection at Emart and Lotte, and here's what I've found:
Another thing they have (although not exclusive to Emart, I've bought it from the GS25 Supermarket as well) is:
Onion tofu type sausage. It's not as firm of a consistency as I'd like, but it'd be nice to add to a stir fry. I found myself just cutting it up into chung gook jang.