It took me about 2 months of living in Billings before I found this place. They have the most amazing deli; they've two veg*n sandwiches on the menu, the ability to make your own custom sandwich, and absolutely wonderful sides. The staff are very, very friendly as well.
I don't make it to Billings too often, but it's good to know just in case. I usually get stuff either at the Food Coop in Bozeman or the Good Food Store in Missoula depending on which kid I'm visiting.