You can locate sites here - www.titleist.com/locator
Without narrowing down the type of fittings possible, there are 145 locations within 25 miles of Scottsdale. Excepting specialty products like SC putters, Titleist offers the full line of clubs in both RH and LH. The retailers (not pro shops) may not offer a full line in even RH clubs. The Advance Fitting Centers have a large offering of LH heads for fitting as well as many of the shaft options. I didn't even know Titleist had clubs until I stumbled into an AFC trying to find someone to work with me. At age 61, retailers pointed me to the one LH iron set in A flex they carried. Even private clubs' pro shops will usually work with non-members. Go where they appreciate you. Search for outdoor fittings with something like a Trackman to get your most personalized fit. Custom fit with Titleist doesn't cost more unless the shafts are exotic.