You can get in touch with Lloyd at Osmic Enterprise http://www.osmicenterprises.com/. He can make anything you need in this regard with a customizable programming interface.
You could contact Tyler directly at [email protected], I'm sure that he would be very helpful in all manner of olfactometry and fMRI. I don't know if he has a commercial unit but he is well worth communicating with. He is still very active in odor research.