I bought this excellent book paper but I made it to my friend. Having a Kindle, I wanted to get me the electronic version and there nice surprise: the eBook is 15.99 instead of the 6 to the paper version.
Same for the art of meditation ...
So I think opt for a book in English that this author available on Kindle at 4 ...
We thank the French publishers for their foresight and business strategy. They do not come then weep!