Pricing will be based on the competition your keywords will be having for an individual country. So yes, the pricing for South Africa will be different from the pricing in UK. For eg. - Your pricing for a keyword can be 1$ for UK and 0.5$ for South Africa.
Really? I didn't know this. I thought the price was whatever you bid per click. Does this mean that keywords rank differently around the world?
Yes, the price is whatever we bid for your keywords but it differ from country to country based on the competition for a particular keyword within a country.
There are numerous factors that will affect what you pay per click, including competition, country, page rank, and quality score ratings. The easiest solution is to simply sign up for Adwords and create your first campaign in order to access their account tools. You can research your keywords there.