From what I remember, they do have pre-rolled sushi as an appetizer. Not really meant for a meal as you can't select different types, as they only serve what they already have rolled.
The main Buffet has sushi all the time & you can also ask for the cook if you do not see any to get some fo you. They also had it at the buffet between the main lobby & the Main buffet think thats called Paty O's now They had it out all the time lunch & dinner The Sushi is awesome I ate that alot for the tuna & salmon Cheers Karen