Deepak you can fetch ADM812 [ MAX812 Equvalent ] through BBS Mumbai. They are the sole distributor for Analog Devices. But they have MOQ of 3000 IC's. But it is the cheapest way to fetch this supervisor [ 0.6$ Exstock ]. If your requirement is small then you can get MAX812 from RS components Stock No. 2631319 I am getting these for Rs.199/- each. MOQ 5. These supervisor are not available at lemington road market.

Regards,
Prahlad Purohit