I wonder why Hannaford and Price Chopper don't carry it in New York, at least not that I've seen. I've only seen the pepperoni in one store. Their bacon is in a lot of places and Whole Foods in Albany seems to carry everything they make except the pepperoni. Any of those supermarkets should have a decent variety of King Arthur flours. Well, at least Hannaford and Price Chopper do in upstate New York.
If for some reason the supermarkets don't have the pepperoni, Healthy Living Market & Cafe in South Burlington probably has it. Never been to their original store in Vermont, but their other second store in Saratoga Springs, NY carries it.
Hope you have a good trip.