I see that you are Hilton Gold VIP.
I know that you said you were interested in hotels in SIN for under $100. But I still would like to make this recommendation:
Often you can get the Conrad for less than US$125, especially on weekends. Since you are a Hilton Gold VIP, you will get a wonderful breakfast buffet included and a small laundry credit.
This is a fantastic hotel. I spent a couple of nights here last year. The service here is excellent and the rooms are very comfortable.