There are so many markets in Mumbai. Find a special one that is of your interest or visit Crawfort market. This is the market that has anything and everything. From the exit of the port it is 2,5 km / 30 min. walk north or take a taxi for 50 rupee.
Dhobi Talao, Chhatrapati Shivaji Terminus Area, Fort, Mumbai, Maharashtra 400001, India