What team are you supporting? Im from Louisiana! Anyways, your best bet to find tickets is craigslist, the newspaper classifieds, or ebay. However, LSU vs Bama is the most heated and popular game, peoplle dont sell those tickets for cheap.
Roll Tide! That's always a great game each year. I'd recommend these guys for tickets but as the previous writer says, they are expensive. You could also try to get them cheaper from students.