The Missing Volume is a mostly internet based business. I do sell books at several Science Fiction conventions several times a year.
The Florida Antiquarian Booksellers Association Annual Book Fair
St. Petersburg, FL
http://www.floridabooksellers.com/bookfair.html
Oasis
Orlando, FL
Necronomicon
Tampa, FL
http://www.stonehill.org/necro.htm
Con*Stellation
Huntsville, AL
http://www.con-stellation.org/
LibertyCon
Chattanooga, TN
http://www.libertycon.org/
SheVaCon
Roanoke, VA
http://www.shevacon.org
Stellarcon
High Point, NC
http://www.stellarcon.org
CoastCon
Biloxi, MS
http://www.coastcon.org
DeepSouthCon
Crescent City Con
New Orleans, LA
http://www.crescentcitycon.com/ccc/index.html
Dragoncon
Atlanta, GA
http://www.dragoncon.org/
Sci-Fi Summer
Atlanta, GA
http://www.sfscon.org
Chattacon
Chattanooga, TN
www.chattacon.org
Ravencon
Richmond, VA
http://www.ravencon.com/
Jordancon
Atlanta, GA
Baltacon
Hunt Valley, MD
Illogicon
Raleigh, NC
Contemporal
Raleigh, NC