Hi, Melanie!
Two of our favorite spots for crab legs in Walt Disney World include
Fulton's Crab House, at Downtown Disney, and dinner at
Cape May Cafe, at Disney's Beach Club Resort.
While Fulton's is
not all-you-can-eat, Guests can
add on additional orders of crab legs should they wish to do so. Currently, the cost of an Alaska King Crab Legs order is $29; an add-on of Snow Crab Legs is $16. (Although I am answering this question at 7:45 in the morning, I suddenly have a craving for crab legs and drawn butter...they are so well done at Fulton's!)
Cape May Cafe, on the other hand, is a seafood-focused buffet which includes snow crab legs. On our last visit, my 11-year-old son visited the crab leg platter several times before calling it quits. ;-)
In short, for us, Fulton's has the better variety while Cape May enables Guests to enjoy more quantity (for one price). Either way, you can't go wrong with a dinner at either of these fantastic WDW restaurants. Better yet, neither one is located within a park, so Guests may visit even if they don't have, or want to use, a park ticket.
Send more questions as you think of them, Melanie; we love to help!
(Now where can I find crab legs at this hour...?)