We don't have many US members here, but I did find this listing for vets in your area: viewtopic.php?f=25&t=14665. There may be others, if this one does not work for you, I would suggest that you go on a U.S. based forum like Goosemoose, where there are more members from your area.
How long has your rat been sneezing? What kind of cage/bedding/accessories are they on? How old are they?