Thats T. F. Green airport in Providence (Warwick), RI. Southwest airlines which has deals serves Providence. I am not sure if they will have deals on such short notice, however.
T. F. Green is just a little over an hour away from Boston and is a popular alternative to Logan.
There is a bus line that goes from the airport to Boston. I am going to post the airport and the bus links. Just wanted to let people know all of the options.
http://www.pvdairport.com/
http://www.bonanzabus.com/greensch.htm