I have been importing products from around the world into my country for around 20 years now. Never bought an ebook or list of sources ever. Heres how I find suppliers:
Approach the embassy of the country you wish to import from and ask for the commercial attache. Go see them if you can, or at least phone them up. They will have lots of information for you. Also ask for trade directories, I regularly get Thomas Exporters Register, along with similar publications from other countries I deal with, all free.
Of course the technicalities of importing and setting up new products are a lot too involved for one post, but this will get you started.


Developing & Selling Your Very Own Products