Havent been to Atlantic City but been to Vegas alot of times, Package deals from the promoters are abit on the expensive side. I have booked a hotel plus flight with expedia and opodo check both for cheapest. Which i have found to be fairly well priced.

If you book it all separate yourself i have also done this it can work out abit cheaper but it takes abit longer trolling the net for cheap flights and finding a decent hotel that is close to where the fight takes place.

Hope this helps abit.