The best place to process 120 film in Bombay is –
Studio Mull Herr
228, Unique Industrial Estate, (Near Siddhi Vinayak Temple)
Off V.S. Marg, Prabhadevi. (Nearest train station – Dadar)
Ask for Mr Harish Valecha.
Phone – (+91 22) 2436 0482
I am not sure if they sell film there, but you can call and enquire. 120 film is expensive in India, so you are better off buying your stock before you arrive here.
Cheers,
Ajay.