Atlanta Figure Show, 15-17 February, 2013:
http://www.atlantafigures.com/show.htmDallas, TX Figure Show, 14-16 March 2013:
http://www.lonestarfigureshow.com/Tulsa Figure Show, no firm date yet, but usually the first or second week of June
These are the dedicated figure shows, but all have an ordnance division for aircraft and armor. Are you interested in IPMS shows as well?
EDIT:[/b] Here is a link to the IPMS shows. Some of these are small local shows, while others - especially in or near larger cities - can be quite large. Nearly all include vendors to one degree or another. Additionally, most of these are multi-genre shows in that they include aircraft, armor, figures, ships, cars, and sci-fi/fantasy. There are a few that are genre specific (usually cars). You must be an IPMS-USA member to enter the nationals (in Colorado this year), but IPMS membership is generally not required for regional or local shows.
http://www.ipmsusa.org/MemberServices/EventsCalendar/EventCalendarList.aspGlen