You should PM me the name of that S stream, Noah. I'm only aware of one possible nearby but have never fished it. I've often thought of hitting it but there always seems to be somewhere else that looks fish-ier.
I've only recently heard of Brookville. Sounds like a two mile stretch of stocked tailwater but a neighbor of mine says he goes up there on "opening day" (stocking day) every year and camps. Aerial views of the water look pretty nice.
The nearest fly shop I've found is located in Clarksville's Bass Pro Shop. It's pretty nice for around here.