Booked 1 ticket for my wife on the Web Special for a one way Ticket on Airtran.com.

There was only one available as of last night, is there any chance another cheap seat might become available? Are my only chances of getting another cheap seat like hers is if someone cancels or do they open up more web special cheap seats closer to the flight date?

Flight is about 3 and half months from now?

Any chances or should I buy the next level (higher price)ticket that is available right now?