Find them wherever you can. They will be very expensive and hard to find.
When I was looking two years ago, I could not find anything under $250 and they may have started at $300 a seat.
I stalked Ebay, Stubhub, TicketCity, and Ticketmaster.
Georgia and Clemson are two of the most expensive tickets and I think ESPN ranked our Georgia games as one of the top ten most expensive college football tickets of the year.