My buffets are limited to two types:

(1) Cheap Indian buffets for lunch. I used to make a few trips through every visit, but I can usually get by with one plate now. Not sure if buffet is the most economical way to go, but enjoy the variety.

(2) Nice Hotel Breakfast Buffets - Sure, I am probably spending half of my per diem for breakfast ($25 - $30 w/ tip), but it always seems to be worth it. Maybe hit an Indian buffet for lunch to balance out the cost (j/k!).