Next Weekend, February 10th and 11th, is Missouri Comic Con. You can head over to Tixr and purchase your tickets now. A weekend general admission pass is only $50.00 in advance. It is $30.0o for a one-day pass. You get a special discount on your passes if you are in the military. Prices do increase after pre-sales end on Friday.
If you buy your tickets in advance, print out the QR code and have it ready when you reach the door. They can scan the code off your phone. Have the code pulled up and ready to scan before you reach the entrance.
If you would like a Photo Op with one of the celebrity guests, here is your link.