I live just west of Indianapolis, but only recently started back into the hobby, so can't help much. There are a couple of places listed in the yellow pages- one on the north side, and one on the south side- but I've been to neither.
I was in a hobby shop in Plainfield yesterday that had some rocketry stuff. It seems to be mainly a train shop, but had maybe 40 rocket kits, and some of the usual accessories. Almost all Estes, but I did see a Quest or two among them.
It's not very exciting, but if you are on the west side during your visit, I thought you might want to know about it.
It's called Big Four Hobbies (Big Four is a nearby railyard) and is on Main St/ U.S. Hwy 40, on the south side of the road, across from Duke Electric Power (can't miss that). It shares a building with a gym.