Try going to
www.vfug.org, it is an online user group that you can join for free. Once a member you can query the membership table by city. I found about 60 vfp users listed for the Phoenix area. I am in Tucson and there is only 20 of us here. I sent the 20 people a blanket question and got a reply from 30% of them. That was the way I found out about Univeral Thread