Ticket master, and also call Fox they are happy to help.
Call the Fox Theater while looking at a seating chart. They will help you find the best seat based upon your personal mobility level. They were very accommodating to me.
I couldn't pull up a seating map on any of the "scalper sites". Ticketmaster is the only one I trust anyway. Too many fake tickets out there. My guess is that if you can't find the ticket on Ticketmaster, then that section is reserved or unavailable for some reason.. Or you might even consider calling Fox Theater.. Beware of end seats. I missed a good portion of a show standing up and sitting down for people coming and going throughout the show.
When you are buying tickets you usually can pull up the seating chart to see exactly what your purchasing
You can ask about Gallery Seating. I believe that is what it is called
Mezzanine tickets are available at Ticketmaster
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