Other than Dey Sound, you can find entry level Audio Technica and Ortofon Carts at SKS Kolkata.
Contact person: Mr. Subho Pathak (+919831163529 / 03365296315)
Pl check other threads, Mohan Music of Chennai has stock of Audio Technica AT-91 cartridges which i think he will courier to you. Search the forum with the words Mohan or Audio Technica.