They will not be at a standard fitter like a Golf Galaxy or small golf club.

Your best option is to find a Titleist sponsored fitter in your area. See "Fittings" at the top of the web page. Usually you have to contact them and you will be notified when they will be at an event near you. Check with them on what Ventus shafts they carry and what you would like to try.

A large regional Premier fitter may have some available as well. Titleist fitting centers - TPI (CA) and Manchester Lane (MA) - will have them - they carry everything.

Some of the specialized club fitters/builders will as well, but that's paying a premium on top of premium equipment.