As TH says - avoid all surrogacy in India! We have both had our fingers burnt through that - it was organised through Global Egg Donors/Renew who used Egg Dnors from SA - and we both have terrible stories associated with it.
But I think you are more interested in DE only in SA. I can recommend it personally. We have a DD through Cape Fetility Clinic which has a 80% success rate (reported to me by the 'Nurture' Egg Donor Agency, which I can also personally recommend.
To get started, contact the clinic directly who will suggest agencies (all overseas donors have to use agencies to get their donor as clinic donors are reserved for local women), or alternatively go straight to a local agency and choose the donor first - they should set up contact with the clinic for you.
DE in SA is cheap and the service is wonderful. Many other women on these boards report good esperiences - I'm sure they will chime in.