I would put Highsmith in Greenfield on the list for the east central area. They maintain a pretty good stock of handguns, shotguns, and rifles, and a decent assortment of accessories. Plus they do gunsmithing. Prices are reasonable, and they are nice people.
Definitely a go to if you are into bass fishing. They have some very high end stuff in there (or did the last time I was in) as well as some middle of the road stuff on both gear and lures, etc.
I've walked into their gun area a few times, but not spent enough time in there to get to know anyone on that side.