Found Singapore Direpublic site which listed Singapore buffet directory listing. According to the site, it will host comprehensive information on Buffet Restaurants, Buffet Cuisines, Price, Address, Menu, etc info in Singapore hotels and restaurants.
You may like to visit the Singapore Buffet site at DIRepublic at
http://sg.direpublic.com/food-and-beverages/buffet
There are quite a number of categories listed there, but $15 and Below Singapore Buffet information is quite helpful to us 