Your question is so broad. You can get a distortion pedal for bass from almost any major guitar shop in Singapore. Or you can order online. What kinda distortion pedal / what music do you play?
Just a side note, fuzz pedals can overpower your guitarist's distortion and drown him out.
But I would choose a fuzz vs overdrive anytime. U might wanna try zvex maestotron (fuzz) or distortron (overdrive), its even has a boost knob.