Yes, yes, we know: Google takes its sweet time in getting all the various parts of the Play Store rolled out to all corners of the globe. This evening (or morning, I suppose) they've expanded the Google Play Books service to South Africa, Switzerland, and Turkey. Android and Chrome users in these countries should be able to buy and read books right now.
Pics or it didn't happen: South Africa
Today's update brings Google Play Books to 39 countries, mostly in North America, Europe, and Asia - in fact, South Africa is the first country on the continent to get access to the service.