Geographic restrictions seems to be less of a problem. Most of the ebooks I'm interested in seem to be available and the overall quality of ebooks have also improved considerably (you even get those fancy covers included nowadays!) and some publishers (most notably Tor) have opted to provide their ebooks DRM-free.
In order to compare ebook prices from the various stores I've put together a selection of 15 science fiction and fantasy titles. These include new releases as well as some backlist titles. In all cases prices are noted in South African Rand. For the ebooks from Amazon the price was converted using the current exchange rate of R10.22. EB refers to Exclus1ves.co.za
|The Curve of the Earth||82.79||122.54||110.00||128.95|
|The Sleep Room||55.69||106.19||75.00||91.95|
|A Memory of Light||208.79||212.47||244.00||286.95|
|The Daylight War||150.99||167.61||253.00||260.95|
|A Game of Thrones (1-4)||248.49||204.81||359.00||370.95|
|The Cold Commands||73.59||122.54||98.00||136.95|
Aside from one title Kobo consistently had the cheapest prices on offer. For new releases the price difference between Kobo and Amazon seems to be relatively small, but on older titles prices at Amazon were considerably more expensive. Our local retailers can't seem to compete with the international sites. In total they were much more expensive than Kobo and Amazon, but on a few titles Exclus1ves were slightly cheaper than Amazon. Kalahari turned out to be the most expensive option out of all the stores.
Using the prices from Kobo as baseline Kalahari was 60.75% more expensive, Exclus1ves 46,07% and Amazon 20.58%.
The prices don't take any special offers into account. The Kindle store offers daily deals and tend to discount certain books from time to time. However, from my limited experience, it seems most of the daily deals tend to be restricted to the US. They also seem to add an extra $2 charge on some discounted titles to cover the 3G delivery (even if you don't own a 3G Kindle).
Kobo also has special offers and in addition they give out promo codes that reduce their prices even further. These discount codes range from 10% to 85% and, for the most part, seem to be usable on any ebook (unless specifically stated otherwise).
Exclus1ves has a loyalty programme where Fanatics members earn 5% of their purchases back. They also have a discount incentive called Stickers where you can earn discounts of 10% - 25% to use on products of your choice.
When deciding on an ebook reader it's important to compare the prices of the ebooks you are likely to read and see which stores offer the best prices. It definitely pays to shop around!