Substitute for LM2937 (5v to 3.3v) regulator
DigiKey has 954 available, Mouser can dispatch 53 immediately.
If you need just a few, talk to a distri, like EBV and beg :-) for samples. If you need higher quantities, the same distri should be able to help you. Distribution is worldwide, and doesn't stop at India's borders! Neither do Internet orders, neither do phone calls.