I think mama store is different from mamak store. the latter refers to a hawker selling teh tarik mee goreng etc...
but i dunno... frankly...

here's a beehoon recipe:
soak beehoon in warm water till soft.
chop some garlic and fry in hot oil.
add a big dollop of sambal belachan, wait for fragrance to come
add the soaked beehoon and stir fry, add an egg beansprouts anything u have, some light soya sauce and msg
add some water to beehoon so it doesn't get burn but has a nice smooth texture
serve with chopped green chillies
i dunno any NYC resto that has chilli crabs but if u ever get to California, check out the Shiok! restaurant which is located in Berkeley I think? it's like a canteen style resto but they got everything, laksa, chilli crab... the works!