I'm in search of prostate stimulation by a Chicago area provider. I'm looking for suggestions

Depending on your price range and tastes, there are many that provide.  

I do, and I'm in Chicago proper.  On the north side. I have a private incall or am willing to do outcalls. Lots of my reviews mention the service.
Elle Solo offers, and she has lots of incall/outcall options.
Sage is in the NW burbs, and has a private incall.
Eva Godiva offers outcalls to lots of different places, but i don't know if she has an incall.  

You will definitely have your pick!