Sorry for the delay on this! I've uploaded the free eBook versions of An Improbable Journey; they're now available on the An Improbable Journey book page.
I've also gone into the pages for both Determination and An Improbable Journey and added individual Amazon Kindle store links for every country which has one, so if you don't usually shop at the American Amazon.com, you'll have an easier time of it. I will be doing the same thing shortly for My Abstract Life, so stay tuned.