Cleveland OH here, not sure there's anything cheap around here that you can't just get anywhere.
We have the Malley's chocolates factory here, I am uncertain as to the quality though as I try to avoid American chocolate usually.
Lake Erie is wonderful for freshwater fish, but they don't exactly ship well.
We invented stadium mustard, which is pretty good if you like spicy brown mustard.
We have local maple syrup, but Vermont's is better, and local honey, but Oregon has better.
Bob Evans started locally, but most of what they're known for wouldn't ship well either.
Oh, and the Amish, we have a lot of them, they make some damn good baby swiss cheese, very mild and creamy.
Most of the best stuff we have is wonderful fresh produce, and similar perishables, which sadly wouldn't last the trip to the UK even if they were to make it through customs