Nashville is considerably more expensive than other SEC locations, but I think they'll be less expensive this year primarily because less UK fans will go - either avoiding the ridiculous expense altogether and/or saving money for the NCAA tournament games. You can already find books for ~$650, which isn't really that bad, especially compared to past seasons. I think you'll be able to get books for $500 once most tickets hit the resale market. Most haven't been shipped or assigned yet.
The best way to find tickets are to:
Call other schools' ticket offices. You may get lucky and get their unused tickets. Check online every day - stubhub, craigslist, message boards, etc.
If you wait until you get to Nashville, you can still get them on the street, from other fans, from scalpers, in hotel lobbies, etc. You just have to be vigilant and aggressive. This will be my 15th straight year and you should be able to at least get in.