I think you may be better off just being open about having different rates.

I'm in the UK. I used to get my internet via a satellite connection. Lots of the internet thought I was in Germany because that's where the sat base station was. Similarly if any of your SA customers go abroad they will see the other rates.

It's a secret you cannot keep.

I don't think there is a way to do this in the base product. It would require some programming.

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Best wishes,
- Richard
Agile Development Consultant, Practitioner, and Trainer
www.dynamisys.co.uk

For anyone else who is looking for a similar issue, I have found a solution outside of DNN for this issue

Geolify offers a solution where you are able to set parameters for directing visitors dependant on their IP address.

Hope this helps