Amazon OneLink is now being rolled out across the site. This system means that you only have to click one button to go and find a particular Armada Wars book on your local Amazon store — Amazon works out for itself what geographical region you are in, and routes you accordingly.
The system is being implemented for Kindle edition links, paperback links, and some audiobook links.
At the moment it's up and running for readers in the USA, the UK, and Canada. People from other regions can click the same link to use the Amazon.com site, or choose from the regional links which are still listed.
One known issue is that OneLink doesn't always register your region on the first click, and sends you to Amazon.com regardless of where you are. Subsequent clicks seem to be handled correctly. Presumably this is a bug that Amazon is working on already.