Indie Megabooth has opened up submissions for PAX East 2014. Developers have until December 15 at 11:59PM EST to submit their application, and those accepted will be notified on January 13, 2014.
The FAQ has a breakdown of what applicants can expect in terms of cost. For instance, the organization recommends you budget anywhere from $2,000 to $7,000 depending on how lavish you want to go. The Minibooth, located within the Megabooth, will run you significantly less with costs ranging from $500 to $1,000.
The Indie Megabooth will take up at least an entire day for you to check out completely, and I've found with the last few PAXs that this is where the best games of the show tend to be.