Half Table--$75-----4'x30" Full Table------$125----8'x30" Double Table----$350----16'x30" Triple Table----$550----24'x30"
If you're waiting for their Artists' Alley, remember that their process for that is a bit more . . . chaotic. (Tables are free, seats are awarded by lottery and on a first-come-first-served basis at the show, & there is a turnover every day.) Basically, if you want a guaranteed spot you'll want to buy in.
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Also, ACen's Artists Alley reg goes live at 5pm CST today. You'll need a sign up/login before you can apply, so do that before we all nuke the site come opening time.
ETA: CST, guys, not EST. The site died an hour ahead of schedule.
ETA2: The site's now opening at an undisclosed time because of its being epically broken. :P
ETA3: The site is officially good and screwed up. In theory, the application will go live tomorrow at 5pm CST (which is not EST or MST or PST).