You can buy and relish some 'hapus', supposed to be one of the best varieties of mango, if visiting the place during summers.
Otherwise, most of the stuff available here are related to the temples and you can buy small souvenirs from the stalls near the temple and the beach.
₹ 6,000 onwards
₹ 2,299 onwards
₹ 990 onwards
Ask a question from the travellers who have experience.