There are quit a few Chinese Buffet places that have crab legs on their buffet, that i would look into around Savannah.... But as far as restaurants nightly you will have to check their specials. Like Uncles Bubba's out on tybee has an all you can eat crabs legs, but I'm not sure what night.. You might want to check out Love's seafood as well... Its not in Savannah but close enough. Good luck! Oh yea and if you are looking at a restaurant and not the buffets you're going to be forking out some cash.