This is geographically stretching it a bit, but I was visiting friends in Easthampton MA (next to Northampton), and they introduced me to a line of locally made kielbasa called Trytko's. Delicious stuff, with no fillers, no gristle, and made in a variety of versions - traditional, cheese, horseradish w/cheese, habanero, jalapeño w/cheese, and turkey.
A couple of things caught me by surprise - first, the fact that the meat to fat ratio is much higher than in commercial kielbasa, making it quite dense and chewy. The other is that the versions with cheese have large (almost 1/2" cubes) chunks of cheddar in them, so when you heat them you need to keep the kielbasa whole or the cheese will melt and run all over the place (as I learned the hard way when I cooked one in pieces). And since each one is almost two pounds, you don't want to be making this for just one or two people.
The only place they're sold is Big E's supermarket: http://www.bigessupermarket.com/index...
If you're heading out to the Northampton area, it's definitely worth checking these out.