You don't let go, do you, Burnstump? Even though it's kind of annoying, it is admirable that you've been searching for this thing that may not even exist for nearly five years. I'd tend toward being a bit curious to know why this is so important to you--

Anyway, I don't exactly know Jimmy Jitters (which seems like a reference of some sort, and not the sort of thing someone would just grab out of the air) but it seems to me that there is a place called "Jimmy Jitter's Coffee Shop" in Monroeville,PA, on Route 22, a couple miles from the Pennsylvania Turnpike, in the strip Mall that has Michael's and Bed, Bath, and Beyond. It's odd, because it's not a chain or franchise, along a highway where almost everything else is. Good luck.