We went to a Buffet concert last August in Philadelphia. We watched for information on the margaritaville website and we (I just asked DH about it) THINK there was a link and phone number along with selling times on the website. I remember it was a Saturday morning, DH was at work on the phone, I was on my laptop and DS was on the PC. DH had the best luck through the phone. We got tickets in the first tier for $80. We received our tickets in the mail along with an apology letter stating that our initial seats were an obstructed view. The gave us floor tickets and hoped they would be satisfactory!! It was a great show and being on the floor is an experience in itsself!! I have no idea how much they would go for!!
Good luck!
Karen