There are some good ones....
One at Dickson Road, along Jalan Besar Rd (Opposite Sim Lim
Tower). It is a corner Old Kopitiam. Lots of Taxi
Drivers go there in the night. If you don't know the place...
look out for the taxis... 
Order the dry ones.... come with pig intestines too.... and/or
pork ribs.....
Pricing from $4 onwards... i think... haven't been there
lately.
yummy. love the soup of prawn noodles and the prawns 